My download for UE4.7.4 is now stuck at 89% installation for about 30 minutes. No solution works for me currently.
Hey
Have you already tried the suggested methods for [troubleshooting the launcher][1]? If so, please go back to that link and provide us with the [debugging ][2]. It would also be helpful if you could provide us with your dxdiag . If you’re not sure how to obtain them, please simply go to your start menu, search for ‘dxdiag’ within the search bar and run the program once it populates in the list. After the program has opened, please use the ‘save all information’ button and save the as a .txt file.
Looking forward to speaking with you further regarding your installation of UE4.
Thanks! 
A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums
[2]: A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums
Hi
We haven’t heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you’re still experiencing this issue, please try the suggestions that posted above and post back here with the requested info.
Cheers,
TJ