I have the shader patch.
Night time with 4Seasons works fine, but it doesn't have transition.
I deleted 4seasons in case of conflict, but still no night with Sol.
I've also tried 3 complete re-installs of Sol today but I can't work it out.
I installed the Lights v0.1.25 preview 49 first, then..
I manually pasted the three folders into AC, then via Content Manager, activated the mod.
Deleted all the other Weather files.
After that I adjusted a bunch of video settings as per instructions.
I did fail on my first attempt with an older Lights package where cars where falling through space but the stated version seemed to fix that.
And just to keep you interested, today I added Wet Mod 2.0 which adds wet versions of various tracks.
Side Note: On the wet tracks the different surfaces seem noticeably effected. eg fake grass on corner is extra slippery etc.