Looks like there was a new patch for the game a few hours ago. I need a bit of time to update the mod, then it should work.
Viewing post in Archipelagates Growth Mod comments
Did you by chance download the source rather than release? This is the most recent release link. Release Delta Patcher v3.1.5. You want one of the bin zips depending on your operating system and then you just unzip and run. Then you place the assembly file on the top row, patch file on the bottom, and hit apply patch. Unless there is another issue, lmk.