Your best bet is to join MAM. From there, you can progress to Aither and other sites within a reasonable amount of time through the invite forums.

It depends where you are in the world. Some countries care more about copyright laws. Sometimes you can get away with torrenting with little to no consequences.

Otherwise, stick to direct download and streaming websites. There are a lot of great sites for movies and tv shows. They tend to come and go. Just remember to install an ad blocker. For games, you’ll need to look at direct downloads. Some good links in other comments.

Yes, you just need to copy the .app file. Adobe Zii patches that file so that is all you need. Don’t need to worry about copying any of the ~/Library files. One thing to keep in mind as macOS gets to future versions finding an older version of Adobe applications that still works can be finicky.