It's happening boys! When is the birthday? I know it was in October but I don't know what day it was.
*Edit*wiki lied, moddb site says it was November 23rd*
https://www.moddb.com/mods/median-xl/news/median-xl-released
Yes, there's (D2MultiRes)[https://www.moddb.com/games/diablo-2/news/d2multires] for the unpatched game. You can try that I guess. It's a good mod but I'm not it'll work on Median because they've changed a lot.
I don't believe so. I don't have a single issue with anything else being too dark. Not one application or game. And vanilla d2 had adjustable gamma and contrast. It wasn't fixed.
https://pcgamingwiki.com/images/thumb/d/db/Diablo_II_Video.png/300px-Diablo_II_Video.png
I would try a new patch again, downloaded manually from https://www.moddb.com/mods/medianxl/downloads/median-xl-13. Make sure to unzip and paste all of them in the correct folder.
If that doesn't work, consider trying to get the game to work without any 3rd party programs like d2se/plugy.
There is also a support channel on the MXL Discord which may yield a quicker solution to your problem.
I don't think there's an easy way, but using HTTrack I copied the docs as they are today, 15 February 2019. They can be found in this Dropbox folder. I hope they are complete, my internet cut out in the middle of the upload, but I think I got everything.
The nice little drop-down menus don't work, unfortunately, but you can just use your file explorer to open the relevant pages. If anybody has a better way than this to access the documentation offline please chime in!