Trying to get OpenGoal to work - keeps saying I have less than 4GB free space

Not a huge priority, but I’ve been trying to get the above to work for the Jak and Daxter games.

When I install it via the official website, I keep getting a less than 4GB free space remaining.

If I ignore it and try to install an ISO, Opengoal will hard crash.

Anyone got any ideas on how to get it working? Or should I go with the exe and use a compatibility tool?