A new beta version of the mod is now available from the downloads section. Some database issues were fixed along with a bunch of AI adjustments. We've been able to get to 1946 without crashes in our hands-off tests, so the mod is now in an unfinished beta state. Full changelog is in the download. Please note that you should delete any previous install of the mod and save games, as this version is not save-game compatible with the previous TFH versions.
The main changes revolve around database fixes, localization (in-game text) fixes, AI adjustments, and a buggy few events and decisions were fixed. Also included is a an experimental OOB for Japan and Manchukuo, where the Imperial Manchukuo Army is modeled as an expeditionary force under Japanese command. This models history better, and we hope it will improve the Japanese land AI's performance. By "improve" we mean "perform worse in a historical manner for balance reasons", because AI Japan is a real beast now and is doing way, way better than it did in the mod's FTM version.
The mod is now in a beta state and we expect there to be bugs, but no crashes. If you follow the install instructions to the letter then it will start up without any problems; I'm testing with the exact same download you guys will get and I follow the instructions I wrote down in the download section and can start up the mod with no problems, so if you're getting startup issues then go double-check the install instructions. Once the game starts though, there may be buggy AI behavior due to TFH changes to the AI system from the FTM expansion. If you get a crash or see the AI fall asleep or build/research something silly then PLEASE comment here, in the ModDB forum for the HPP (check out the forum link to the upper-right, next to images), or the mod's main forum (official page in the mod's profile to the right) telling us what happened. The more detail you can provide the faster we can fix the bug or crash.
For AI-related bugs, it would help tremendously if after you quit the game you would go to the folder Documents\Paradox Interactive\Hearts of Iron III\HPP\logs, open the file system.log in notepad or some other editor, and check the bottom of the file for errors. This file is deleted every time you start the game, so please look at it and report any errors at the bottom before you start the game up again if you saw the AI fall asleep. If you do see any errors please report them, because the errors will point us to the files we need to fix.
Also, please keep in mind that generating the map cache can take a long time and hog up a bunch of memory. If you have an older computer, you may want to go to Documents\Paradox Interactive\Hearts of Iron III\map and copy your vanilla cache folder to Documents\Paradox Interactive\Hearts of Iron III\HPP\map (make this folder if it doesn't exist). This will bypass the map cache generation. You'll lose out on the visual region changes (the thick black borders on the map), but nothing else.