So a few days ago I installed a launcher update and all of a sudden the entire launcher and the engine started running really really badly, like unusable. So I thought the best thing to do would be to reinstall the launcher and the engine. Now I have the launcher installed but I can’t get it to install 4.10 successfully. Every time, it gives me error code code R-1638, and points me to a page explaining this has to do with my Visual C++ redistributable install. So I did what it said and unistalled the redistributable. But the install is still failing for the same reason. I even tried installing the redistributable from Microsoft directly and running the installation. That didn’t work either. Then I tried unistalling that redistributable and running the installer. That didn’t work. Then I tried running the actual UE4 prerequisites installer inside the engine directory, and that told me the install was failing because a version of the prerequisites were already installed.
Have no idea what to do now.