Among the most significant changes with this year’s Elements releases has little to do with new features but instead concerns the ways users purchase and own the software. While prior versions of Photoshop and Premiere Elements have been lifetime licenses — the user buys the software and then owns it indefinitely — this year’s release has moved to a three-year license term.
No they don’t. The dev has to opt to use Valve CEG (custome executabke generation) for that to be included in the game files, and that is entirely optional.
On these games, you can do exactly what you suggest.
Here’s a list.