When i selected a version of Unreal Engine and i click on install button nothing happens.
I don’t know what to do.
Thx for the help
I need a little bit more information.
How and where did you install the 'Epic Games Launcher?
Do you get a error or something?
Is this happening on all the version’s?
Do you get the “Please Wait” message?
For now I can give you a few thing that can help.
- Run Epic Games as administrator and try to install Unreal again.
- Reinstall Epic Games. Download - Unreal Engine
Make sure you get the launcher directly from original source. - If you get the “Please Wait” message, Search on the UE4 Answerhub. There are already a lot of questions and solutions on the UE4 Answerhub.
I hope this will help you.
Hello , i have run the laucher in administrator and it work.
Thx for your answer
That help me a lot
I have the same problem but it did not help me. I have been trying many versions none of them worked. Literally nothing happans when I click Instal.
Go to Library, and then click install
You got the answer that helped me,ThatSweatyDude.Thank you
for my problem, it said close epic games launcher and I had never had it open and I need it for an online course I’m doing!
I know this is old but running as administrator resolved the issue for me, thanks 
Fixed_ Unable to reinstall Unreal Engine. Install Unreal button inactive.
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If you are trying to reinstall the UE, and if is not happening from Epic Games library,
Uninstall Epic Games (disconnet net or it says It is still running. you can also check the background running apps from right side bottom where you see antivirus and bluetooth icons, right clic or Epic games icon and close it)
Go to C/ Programe Files/ and delete the Epic games folder. Just delete it so it goes to recycle bin, just for precaution for anything you do in C drive.
Install Epic Games, connect to net and update.
AFter that lauch Epic Games
Now you see install UE is active and and you can choose the version.
This worked for me.