See that 8 and 9 have different application identifiers. This might be confusing your computers
Running GS 9 and switching back to GS 8
Since GarageSale 9 uses a different application identifier, you’ll need to grant it access to each eBay token in your Mac’s keychain. When the system displays such a permission panel, please click the ‘Always Allow’ button if available.
GarageSale 9 will copy all your data from GarageSale 7 or 8 into its own library folder. In case you are encountering problems you can always switch back to GS 7/8 and continue were you left off before switching to GS9.
You’d need to use the GarageSale’s import/export functions to bring back listings changed or created with GS9 into your earlier version of GarageSale.