I'm using the KolMafia.exe from last weekend, and extracted the 10100 jar file into the same folder. So I should have all of the released content up to the 10100, right? But I don't have the choice adventures for either of the candy locations.
You are either running the KoLmafia.exe from last weekend or you are running the KoLmafia r10100 jar file. I don't know what it means to "extract" the 10100 jar file. At a guess, perhaps it means that you pulled the data files out of it.
If that is the case, it sounds like you are running the old .exe file with the newer data files as, essentially, overrides. Choice adventures do not appear in data files. They are hard-coded into the executable. Therefore, if you are running a week-old .exe file, there is no surprise that you do not have code modifications submitted later.
You should never "extract" a .jar file. You should simply execute it; every system - Windows, Mac, or Linux - can do that. Where did you read that you were supposed to "extract" a jar file? We need to quash that suggestion ASAP, since it's simply wrong.