1. Make an empty directory on your bigger volume (for instance mkdir /Volumes/HDD/VelociDrone)

2. Make sure that you have write permissions to that directory (chown it if necessary)

3. Execute:

rm -rf ~/Library/Application\ Support/PatchKit/Apps/32bc8fc6

ln -s /Volumes/HDD/VelociDrone ~/Library/Application\ Support/PatchKit/Apps/32bc8fc6

Now run the launcher. Game will be installed on your bigger volume and it should no longer complain about the disk space if your usual drive is lacking space.