What I'm trying to do: Launch any version of Minecraft from the launcher (I tried 1.14.4 and 1.15.2)
What happens: Stops loading and responding at the point the image shows.
Attempts at fixing it:
reinstalled the launcher alone (nothing changed)
reinstalled the launcher after I deleted the .minecraft folder (nothing changed)
tried downloading the instance in a different folder from .minecraft (nothing changed)
tried compatibility mode for Vista (made it start in the old launcher) and then moving back to normal once the instance downloaded as a video suggested (worked in compatibility mode but when I moved back to no compatibility mode it was broken again)
Added note: It started breaking while I was playing with modpacks from Twitch, after which the same happened for vanilla