I tried starting the AMC Squad standalone with the "built-in port" option and a message log/start up window pops up for just a few seconds and then closes down without launching. I attempted to launch the WG Demon Realms standalone to see if it was an issue with standalones themselves but that one seemingly worked fine.
EDIT: Sorry, should've thought of this before posting but I ended up getting it to work by deleting it and reinstalling it. I downloaded the most recent version of BuildLauncher and replaced the older one so something probably got mixed up in there.
I tried starting the AMC Squad standalone with the "built-in port" option and a message log/start up window pops up for just a few seconds and then closes down without launching. I attempted to launch the WG Demon Realms standalone to see if it was an issue with standalones themselves but that one seemingly worked fine.
EDIT: Sorry, should've thought of this before posting but I ended up getting it to work by deleting it and reinstalling it. I downloaded the most recent version of BuildLauncher and replaced the older one so something probably got mixed up in there.