Where can I download the english CK2+ mod? The mod section of the paradox forums appears to be empty, even when logged in. When I google CK2+, I can only find the mod in Russian. However, it seems to be rather popular and clearly exists in english. I honestly cannot find it, probably because "CK2+" has chemistry related search results.
You should register your game with Paradox to see certain forums, like the User Modification forum for Crusader Kings 2. It's their way to provide a little extra to people who don't pirate their games.
Anyway, after you've registered you'll be able to access the Master Mod List topic which lists and links to about all of the mods for the game, including CK2Plus.