I researched a bit and I found the Stack Overflow post with the same name, but it included some software that doesn't exist today; these posts were made like a decade ago. Anyways, I'm using an older PC with a 32-bit System! Yes, I know it's quite old, but I'll get a new one pretty soon, but until then I'm gonna use this one. Every time I open Sublime, it pops an Update window. It's so annoying! I looked for the solution, but unfortunately, I've never found it. I don't know whether I should've written this to StackExchange, but anyways. Please, don't close this question too early, I just wanna know the answer to this problem. Thanks, anyone for replying! :)
Oh, just in case if you need my current version, it's 3.2.2, Build 3211
If you buy a license then you can switch off the automatic update check as is noted here: https://forum.sublimetext.com/t/paid-vs-free-version-of-sublime-text/45846
There is not supposed to be another way to stop that update window.