Buy/Download old versions (PS5 for win98)

I have a windows 98SE system (yeah, I know, old stuff)

Is there any way possible to download the trial versions of Adobe Acrobat 5 and Photoshop 5?

And are the full versions still for sale?

No and no.

Photoshop Elements 2 still supports Windows 98SE. However, if you buy it in a multi-product bundle, other programs in the package may not.

PSE is a little behind the upgrade curve for PSCS, I wouldn't be surprised if they decide to eliminate Win98SE support in the next version.

If you don't need CMYK, or Duotones, or to see separate RGB channels, or a few other features, Elements is a fine product.