Can you clarify:
- Have you already disabled synching on your main Mac?
- If not, what errors do you get on your laptop that don’t appear to be able to be fixed?
That’s the error you are referring to, I guess. Did you already try to remove the folder “Synch.leveldb” in your GarageSale database folder on your laptop?
Anyway, as far as I can see your main Mac isn’t synched at all yet. That’s most likely why you don’t get it to work on your laptop.
It’s worth a try to disable synching on your main Mac, restart GarageSale and then re-enable synching. In the prompt select “Overwrite Data on Server”
Before making changes to the synching you better make a system backup first. Just in case.