I couldn't imagine life without Sol, Content Manger and Custom Shaders Patch. It's incredible stuff and while it's a bit daunting at first setting these things up, it's worth your time and the troubleshooting you'll most likely do at various stages when you install things wrong but again, all worth it.
Sol in particular is an absolute must have for Assetto Corsa. It's now at 2.1.1 looking it's best ever along with a bunch of quality of life tweaks to make your experience better and less cumbersome. Along with that I believe (and am still testing) dynamic weather to simulate real conditions has been improved on as well.
Least I can do is give the talented modder a good review and once you try it out, you will want to do the same! Can't wait to see what the future holds.