None.

Edit the settings.txt to have the correct cookie data for steamLogin and sessionId, as is stated in the documentation.

Get the new version

Hmm, what does the error log file say? I'm guessing it can't load the proper SteamWorks DLL.

Yeah, some idiots got hacked hours or days after running this program and blamed it on people who were trying to help them by fixing IdleMaster while JShackles was on semi-permanent hiatus. I decompiled the init routines to check if something was off, no strings pointing to weird websites. Nothing of the sort. No good deed goes unpunished it seems. Moot point now that they got their accounts back and JShackles uploaded an official release.

Uhm, you can't unlock badges by just idling, you get ~50% of the cards for a badge by idling, the rest you need to trade or buy.

Blacklist all others?

Tried getting a release compile to replace the one in the download zip, but it's having issues loading the SteamWorks dll.

There has been a proposed fix for the null reference issue in github for at least a year now, and I just proposed a simpler solution, but since JShakles is out of the idling game, no means to publish it properly, also have zero experience in github.