Older version of adobe apps - ways to download it

I recently upgraded my imac 2011 (more Ram and SSD), but now i can't download older versions of adobe apps (and i used to have them, before the upgrade). Doing some research i found this website (it shows in this community also) :

https://blog.smu.edu/itconnect/2019/12/18/access-older-versions-adobe-apps/

I downloaded the files from adobe 2018 CC. To do that, i copied the link address and puted on a private window in google chrome. The download started automatically. I downloaded the files and opened them. But now it is asking me for my adobe creative cloud credentials. I did not put them, because i am affraid it has some virus and could steal some information from me (like financial, credit card etc). I'm already logged in on the official creative cloud app.

Has anyone ever downloaded files from this website and it worked? Is it trustable?

I can't upgrade the system in my iMac, so thats why i need the older version. I've alread contact adobe support and they told me they can't send me the older versions... I also tried to download from Pro Design Tools website, and it didn't work.

Any help is appreciated. Thanks a lot.