LR - depends what you want to use it for. Basic editing, Irfanview is good and free. For Photoshop type functionality, GIMP will give you more than you probably need, but is Open Source and free. Lots of other commercial programs available but, since I use Lightroom and Photoshop, I can't say much about them. Adobe do sell Photoshop Elements (£55) which is a simpler version.
Andytug - Adobe have made their (now very old) CS2 products available and they are essentially free. Due to "technical difficulties" Registration has been disabled and serial numbers are provided.
https://helpx.adobe.com/creative-sui...moid=19SCDRQK#
You will need an Adobe account (free) to download. These are anything up to seven years old and were designed for Windows XP so no guarantee that they will work properly on later versions. There are also MacOS versions but they are for Power PC versions only.
Could be worth a try.
Messy