Looks as though I am a bit behind the curve on this since I am only an occasional user. But I offer my expereince for what it is worth. I am running using Windows 10 Pro. I uninstalled Cura 3.6 (I think it was) the installed 4.4.1. I found that the program hung up when starting and 'Loading preferences'. I started again and uninstalled 4.4.1. I then looked for and deleted all Cura 3.6 and 4.4 files I could find on the PC other than the downloaded installation file. On re-installation the program ran successfully immediately as the .run after installation' box was ticked and I loaded a file. I created a shortcut on the desktop and tried to run again but it failed when 'Loading preferences'. I repeated the whole exercise and had the same problem again. Unfortunately I do not have the means to revert to V4.3 as some people seem to have done. Is it possible to make this available for download again, please.