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By hotfix do you mean the 1.3a hot fix?

If you get errors after installing it to a vanilla 1.3 version then you installed it wrong.
If you have mods inatalled then it could be a problem with them.
 
The 1.3B is an update not a patch. You can find it in a sticky thread in the General forum. You need to extract it manually into your HOI2 folder.
 
tagwyn said:
This is not exactly the nature of this thread, however, it is close. I have installed 1.3a and it seems to have worked seamlessly!! What are the changes made from 1.2 to 1.3 and to a. and b.. By the way, where is b. that I might install it? Would you help please. I am a friend of Paradox and of HOI. I am sure you have these changes compiled somewhere so you would not have to rel-compile them. Please help me. Thanks. Tag
The changes can be seen in the sticky thread that says the latest patch is ...

Actually they only go to 1.2, you can see the major gameplay changes here:
http://forum.paradoxplaza.com/forum/showthread.php?t=219038