Im experiencing a similar issue where i cannot install any engine versions, install button is available click it then the Fab spinner goes gray for about 30 seconds then nothing happens then sometimes when i exit the launcher i get an UE4 crash screen with the same error listed above. Tried all forms of removing all epic content including a Rivo uninstall, reg clean, app data clean etc nothing worked. Got so fed up i just tried on my laptop that has never had any epic software on it and the launcher exhibits the same issue cannot install any version of the engine so i think its still BRICKED!!!
And how can you install the latest version that supposedly fixes the problems if the website only has an April version and the Epic Launcher itself doesn’t work to show the update?
I have reinstalled the launcher for the umpteenth time, and it seems to be working now. I hope it stays that way.
This morning it appears everything is back and work. Tested on both my machines a new license agreement showed up. So i suspect they updated the license agreement and the workflow for installing engines somehow got borked. For me the issue is resolved i recommend for others that had this issue to check again this morning. I didn’t have to install the launcher or anything and 5.6.0 and 5.5 installed without issue.