I inadvertently released 0.10.4 with a critical bug in "Save & Launch", which generally only showed up for first-time users. The builder tried to install the billboards.goomod file even when it didn't exist. This is now fixed in 0.10.5.
I'm now using mantis for issue tracking for both GooTool and this site. You can find it at /issues. Before you can access it, you need to logout from this website and log back in again in order to copy your password across.