Hello. It seems that every update done automatically for the WeMod app triggers a “threat blocked” warning. This screen also says that it found “IDP.Generic.” in the update.exe download.
What is it and will I be getting this every time the app updates itself?
Hello. 
This is called a false positive. It will happen with trainers every now and again, no matter where on the internet you get them from. It is triggered because of how trainers work (injecting code into memory addresses that a game is running on in your PC’s RAM). They’re harmless.
Please consider using the search button before posting, as this has already been addressed many times. This thread here, for example, will explain in better detail why it happens and how to resolve it: My antivirus marked WeMod as a Trojan - #2 by Ravenfyre.