So guys, double check if you might have something like that installed on your PC without you even knowing it, go through the task manager to see if something unfamiliar to you is running, and if you notice something you're not sure what it is try googling it to see what's that.
I don't know how that software ended installed (this is all happening on my girlfriends PC so.), but I've deleted that piece of crap.
Now, this is where I think I've solved the problem - I've opened Task Manager to check if something related to Origin is running, as suggested in some previous posts about this, although I've never had Origin installed, and as I was scrolling down, I've saw something suspicious called "LavaSoft" or something like that - and it turns out it is some kind of a AV program, I guess something that sneaks onto your PC when you are downloading something and you are not very cautious. Turned off Windows Defender and Firewall, and than added both disk C:\ and D:\ (this is where my Downloads folder is) in Exceptions in Windows Defender, and also "Program Files(x86)" and "Program Files" on C:\, and "Downloads" folder on D:\ I've kept only original zipped download files. I've deleted ALL The Sims 4 related files, even unzipped downloaded files. Not sure what exactly did a trick, but here's what I did: Ok guys, chatting with myself here, but maybe someone will find this helpful. I would really appreciate if someone could help about this, any suggestions what I could potentially missed, or anything. Once again, I've been always using only g4tw version of TS4.
I've even uninstalled the game, downloaded it again along with the ultimate-fix, go through every step, and again the same error. I've tried searching for the solution on this forum, but nothing seems to work for me. Also, I have never had Origin installed on my PC. I must say that I was not adding anything new to the game, no new patches, no new packs or anything, game just stopped working. I've been playing your version of The Sims 4 without any problems for months, and everything was working perfectly, but then one day I wanted to start the game and out of nowhere I got that godawful message about Origin not running. First of all thanks for all the great downloads and fixes you've posted before.