It was not removed I am sure since I still use it. You might have some issue at your installation. If nobody had this experience, there is not much one could tell. You could use the bug submission form at the 1st post and attach pictures of your screen with the behavior you are seeing at the launcher and give details about your environment: OS release, GPU model + driver release, CPU, amount of RAM etc, but the screenshots are necessary on the launcher side.
4.15.1 is there for me, but I also updated to it.
I still have Preview, never yet updated. But mine shows 4.25.0 as the next update option, not even 4.25.1.
Anyway between all the crash reports and Win 10 glitchiness mess, Iām using 4.24ā¦
until UE5 comes out! 
Great to finally have some modeling tools included. Unfortunately I feel that they still need some improvements. I donāt understand why there is only a tri based selection and not quad based and I hope this will be improved. Moreover basic selection tools like ring and edge loop selection shortcuts or buttons would be very nice.
āThe procedure entry point DXGIGetDebuginterface1 canāt be foundā
Is this going to get fixed?
Anyone having luck with using skeletal meshes with morph targets without awful shading or seams issues (skinache!)?
afaik this hasnt even been confirmed yetā¦chances are Win7 support was just silently dropped for both the editor and packaged games. keep an eye on the software requirementsā¦its still in there in the minspecs, but that may change with the next doc updateā¦
For some reason it would not show up at all as an update.
I had to uninstall everything (the engine and the Epic launcher) redownload the laucher/engine installer, reinstall it, and only then it would show up as an option.
But now it wont launch the engine:
"Launch Failed
The prerequisites for Unreal Engine failed to install.
Error Code: LS-0019-IS-0001"
I searched for that error code and nothing came up.
So Iām not sure how to fix the error code if thereās nothing referencing it.
I did the search now and this came up on this forum: https://forums.unrealengine.com/unreā¦-error-is-0001
Loading a map that has tiled landscape using open level in engine is fine, after build It freezes up and donāt load the map for like 10 mins. and can crash on lower spec pcs.
how to reproduce this
make a project, import a tiled terrain 1017 size tiles.
add a widget with buttons that use open level and point it to your map with the streaming levels.
build windows 64 development, once clicking the button on widget it will take forever to load
and crash sometimes no error no crashlog.
also if you have a widget that loads up on event begin play in a Level blueprint, it scales its self really huge???
Please fix these issues.
That would be a major disaster for my group if they dropped WIn7. It would essentially be game over.
I donāt see how it is a game over if you can still use previous releases. Also, there are some technologies that are impossible to use with Win7 like Dx12 and the Dx12 extension for Raytracing. If it is a game for consoles, mobile and mac, ofc those doesnt matter but again the more time pass, more restricted you are when using an outdated OS, with no support from Microsoft anymore, which means any issues with gpu drivers wonāt be fixed by vendors or issues in the engine wonāt be fixed by Epic if the root cause is on the outdated OS. At some point, the drop of the support will happen.
what do you think would happen, if weād tweet that to our customers, out of which 50% are still using Win7 for one reason or another? 
Dropping WIn7 creates problems for our marketplace items. We wonāt be able to test beyond 4.24. As for Win7 being unsupported by Microsoft, thatās not a big deal. Win7 has been very reliable for us and itās familiar and stable. If it aināt broke, donāt fix it. The lack of DX12 is not really a killer. Android many of the other platforms listed as being supported by UE4 donāt have DX12 either.
This would only really be viable if Epic followed some kind of LTS plan, which they donāt.
There are quite a few massive bugs in 4.22-4.24. The only way to fix these will be to upgrade to 4.26+ (thatās if they donāt just break even more things in 4.26).
A good 30% of people are also still on Windows 7 and I would wager a big chunk of developers (at least from my experience) are still working on it - Windows 10 is an absolute mess sometimes. If there isnāt a good reason to drop it (āDX12 doesnāt workā isnāt - other platforms supported by Unreal donāt have DX12 either) then why drop it?
Where is this coming from? In my experience every dev is on Windows 10 and all gamers I know are on Windows 10. Hell, even my dad threw in a towel and updated to Windows 10.
The LTS plan I would agree on game engines that does not provide the full source code, but Epic does provide, so in this case I agree that you would require an expert user to follow up the issues being fixed and implementing them in an older source code, not every team has this person. There is not much to do reallyā¦ my life currently is looking on how to implement solutions using UE4.17 and make sure they will work on later releases, ofc I would love LTS option and this would mean I wonāt be stuck on an almost 3 year old release. We have plans here to shift from 4.17 to 4.25 or 4.26 (the one which fits better in terms of feature set and against bugs). I do believe the last release for UE4 before UE5 will have a LTS plan offer.
Just something about DX12, since Epic mentioned 4.25 is having raytracing as production ready feature and it relies on Dx12 (for Windows 10 at least), it means DX12 is working atm enough to be also said production ready.
Itās nonsense, of course.
That said, it doesnāt look like anyone intentionally dropped support for windows 7. They just accidentally used an API that is not available on windows 7 while changing something unrelated in the DX12 RHI, and it is easy to fix and restore support for windows 7.
You can do a search on web and find Win10 for US$ 15.00 (no physical box and for OEM), there are plenty of websites selling them, you just need to verify if the site is trustworthy do make a purchase and you only need one machine upgraded for a final test, which is not ideal I know, but it is the cheapest route.
Could you please verify with dev team about issues people are reporting with Windows 7 and the support dropping happened or not? (Check the last 20 posts) At this time, the thread is going to the speculation side of things, which is not good, and an official position would be welcome