Dear Community,
For the first time, I cannot seem to install a new version of Unreal. When I click the “Install” button in the epic Launcher, nothing happens. I currently have 5.4.4 and 5.6.1 installed.
Any advice would be very much appreciated!
TIA,
Ben
Hello there @Ben_Blau!
Testing on my end, the install seems to be working as intended:
There could be an issue with your Epic Launcher, I would suggest a reinstall. And if the issue persists even after that, then the next step would be a full uninstall/reinstall of all Epic software from your setup:
Same problem here. Remove everything and reinstall EpicGamesLauncher has no effects.
Any version of UnrealEngine, it add the button, but the Install button has no effects (no error, no install, nothing)
Someone have another idea ?
Edit:
Don’t know if it’s link, but i found this in log :
[2025.11.17-21.03.22:822][403]LogHttp: Warning: HTTP request timed out after 30.00 seconds URL=https://launcher-public-service-prod06.ol.epicgames.com/launcher/api/public/assets/Windows?label=Live&namespace=ue
[2025.11.17-21.03.22:867][404]LogOnline: Warning: OSS: Invalid response. CorrId=UE4-819d9b0048b3a3275b9a99bcab88f032-4609E3B949C858B61AA800A4E5E94AC1-230E3D584894DE67B3EE02B42F0BD5EF code=0 errorcode=ConnectionFailure errormessage=Échec de la connexion au serveur. errorraw=ConnectionFailure
[2025.11.17-21.03.22:867][404]LogOnline: Warning: OSS: QueryEntitledBuilds request failed. Échec de la connexion au serveur.
Don’t know if it’s normal too, but after click on Plus button, i just notice that it list only x.x.0 version.
For example : it doesn’t display 5.4.3, but only 5.4. As you can see in screenshot
Sorry if i’m spamming but :
Finally working… with “EpicGames Launcher” v18 (the latest, v19.0.3 not working… on my computers)
Hi All i found a fix go to the download settings after install failed in Epics Download Manager then disable Automatic Update Recent Tiltles that worked for me in the latest epic game launcher…UE 5.7 then just retry the install.
Nope, this doesn’t work. Not working for 2 machines.
latest version v19.1.1 still not working. Still same result : nothing happens when click on install. And list only x.x.0 version, no subversion.
Still using Epic Game Launcher v18 for working
Note : I use latest Windows 11 (25H2 build 26200.7309)
I m having the same issue-not subversion. Unable to install any engine at all. And this problem had happened again since beginning of the year. It’s really a nightmare.
I tunneled my traffic thru a VPN and retried, that worked.
This worked for me! You are a gem. Thank you!!
I recon it’s the Unreal Official Server issue. I suggest, for the Epic technical support, please kindly reseting your related engine installing servers, I am 99% sure the problem will be solved instanly.
As I had using a newly fresh Windows 11 machine to install the Epic Installer v19.00 (latest on Unreal Official site), the result is the same-Where happened to be suffered & affected from the similar problems where tons of thousand of Unreal developers had, and having suffering from development for momths.
Problems are :
When selecting the wanted game engine, the subnumber of the version are are ‘0’s. eg. UE 5.7.00 or UE 5.5.00 etcs.
Unable to download/install any Unreal Game Engine & plugins/libraries from the server at all, even letting the machine to be left for days online.
Please kindly reseting all the related UE servers. I think this is the only solution. Greatly Thanks in advance.
New Launcher tested : v19.1.6
Still same bug :
Still using v18 for working
That’s right! Still not working, can’t download/install any thing.
Yep, I have the same issue with games and any assets I own as well. The first level support people have closed my ticket twice now and it needs to go to a higher network level engineer. It is a Cloud Flare error for me.
[2026.02.16-20.33.43:145][125]LogOnline: VeryVerbose: OSS: Running Mcp request for user=ba8eae238076485e8bee05bc8d559af9 url=https://library-service.live.use1a.on.epicgames.com/library/api/public/items?includeMetadata=true&cursor=eyJvZmZzZXQiOjIxMDB9
[2026.02.16-20.33.43:228][127]LogOnline: Warning: OSS: Invalid response. CorrId=UE5-ebe39f7e4281b21cf9e54aa66b90109d-B63C427A47F01B1888285DBC6E17F10A-87FF429A450E0B49AA8472B9DED6BE84 code=504 errorcode=errors.com.epicgames.common.processing_exception errormessage=Sorry a processing exception occurred while we were waiting for you to send us request data. (tracking id: [dc4306e2-49c7-43fc-aef4-72b55d99963d]) errorraw={
“errorCode” : “errors.com.epicgames.common.processing_exception”,
“errorMessage” : “Sorry a processing exception occurred while we were waiting for you to send us request data. (tracking id: [dc4306e2-49c7-43fc-aef4-72b55d99963d])”,
“messageVars” : [ “dc4306e2-49c7-43fc-aef4-72b55d99963d” ],
“numericErrorCode” : 1037,
“originatingService” : “launcher-service”,
“intent” : “prod”,
“trackingId” : “dc4306e2-49c7-43fc-aef4-72b55d99963d”
}
[2026.02.16-20.33.43:228][127]LogOnline: OSS: Service status updated [Connected] → [ServersTooBusy]
[2026.02.16-20.33.43:228][127]LogOnline: Warning: OSS: QueryEntitledBuilds request failed. Sorry a processing exception occurred while we were waiting for you to send us request data. (tracking id: [dc4306e2-49c7-43fc-aef4-72b55d99963d])
[2026.02.16-20.33.43:228][127]LogCommunityPortalOSS: Error: FCommunityPortalOSSImpl::OnQueryEntitledBuildsComplete UserId=ba8eae238076485e8bee05bc8d559af9 bWasSuccessful=false
[2026.02.16-20.33.43:228][127]LogCommunityPortalOSS: Display: …found 0 entitled apps
[2026.02.16-20.33.43:228][127]LogPortal: Error: FAlertReporter: Reporting Alert code: BI-QE-1037
[2026.02.16-20.33.43:289][128]FAppDiscoveryService: No appid specified
[2026.02.16-20.33.43:321][129]LogOnline: OSS: Service status updated [ServersTooBusy] → [Connected]
For anyone wondering here is the actual error. It is Cloud Flare presenting an interactive or managed challenge on an API request which obviously there is no way to respond to it so you can’t put APIs behind a protection like that. I have tried explaining this to their first level support people and they are just not getting it.
[2026.02.17-13.35.59:503][122]LogOnline: Warning: OSS: Invalid response. CorrId=UE5-f5cf46b345aa99001b118ca246c53909-53E3AE194150970D2B01D9BD78112394-C697F24742D58EFE675C979E0A783FF7 code=504 errorcode=NonJsonErrorResponse errormessage=An error occurred while communicating with the game servers:
HTTP 504 response from https://launcher-public-service-prod06.ol.epicgames.com/launcher/api/public/assets/Windows?label=Live errorraw=
The web server reported a gateway time-out error.
[2026.02.17-13.35.59:503][122]LogOnline: OSS: Service status updated [Connected] → [ServersTooBusy]
[2026.02.17-13.35.59:503][122]LogOnline: Warning: OSS: QueryEntitledBuilds request failed. An error occurred while communicating with the game servers:
HTTP 504 response from https://launcher-public-service-prod06.ol.epicgames.com/launcher/api/public/assets/Windows?label=Live
[2026.02.17-13.35.59:503][122]LogCommunityPortalOSS: Error: FCommunityPortalOSSImpl::OnQueryEntitledBuildsComplete UserId=ba8eae238076485e8bee05bc8d559af9 bWasSuccessful=false
[2026.02.17-13.35.59:503][122]LogCommunityPortalOSS: Display: …found 0 entitled apps
[2026.02.17-13.35.59:503][122]LogPortal: Error: FAlertReporter: Reporting Alert code: BI-QE-504
Also, Cloud Flare has a hard timeout limit of 100 seconds of anything proxied unless you are on the Enterprise plan, which I doubt they are, so people like me with a huge library are going to timeout every single time.
https://community.cloudflare.com/t/default-timeout-limit-increase/240042
I really wish I could talk to someone higher up or a network level engineer. I literally do this for a living and setup the exact same systems. Talking to normal support people has been fairly useless so far.
I can also login with a different account that has a normal small amount of games and assets and it also works fine. It is strictly related to having large amounts of assets.
Finally, THANK YOU for pointing out where’s the problem !
Now almost all the possibilities of the probelm had been scoped down, almost close to where it is situated. For the technical support personnals of EPIC, please kindly fixup this mishaps.
This is really a Epic’s most fundamental installation/setup problem which has been haunting for more than 5 years or more for the ‘Non Exterprise Plan’ community. The managing/support level of the company ‘had failed’ in communications/supports between its large developers community serverly.
“I really wish I could talk to someone higher up or a network level engineer.”
Yes. This is the really MOST IMPORTANT issue, which I had been facing for years with using Unreal Developing Engine- as a NON-Enterprise Developer. There wasnt any real techincal link/support for the developers (unless you’re entering the Enterprise level), this is a SERIOUS PROBLEM before any one consider to invest in this game engine.
“I can also login with a different account that has a normal small amount of games and assets and it also works fine.”
Yes. As I’m having a resonably large libraries & plugins, which had invested/built up heavily over the years, who’s also suffering from this similar re-installation problem. And this is the actually where the problem lies!
I can also confirm that Unreal 5.7 refuses to install. Strange thing is that last night it got about half way through downloading before it stopped completely. This morning it’s stuck on “Installing” with an empty progress bar.
Update, Unreal 5.7 started downloading again after doing nothing for about 3 hours and finished installing. 
