Hi Paul,
I see, thanks for explanation.
The situation is quite complicated. I now work on GS from 2 different machines. One is left in the office and works 24/7, at least it will start to work as soon as a solution for the “out of stock” issue will be found 
(Issue with multiple quantity listings and auto relist feature). I work and check it remotely from my laptop. The second machine is used to manage orders, create new listings but not for working and managing active listings. In other words, one machine is used to manage active listing with auto-ending and restarting feature (GS9), the second one (with GS8) is used to only create listings (which are then imported into the first Mac to be listed) and to manage orders. I hope I explained it clearly (sorry if not… let me know). This is why I don’t care if their database are different. I won’t lose the work on GS9 because this is still the main machine, but not yet fully working on its own. Hopefully soon, when a workaround for the “out of stock” issue will be found ( ), the first Mac with GS9 will work on its own, and the second Mac, whose listings will be all expired in one or two months, will be only a database of inactive listings. This is why I need GS downloading photos for orders which listings are not in the database (thanks again Ilja for that, I will check soon if everything works fine).
Then, the second machine has still Sierra installed and I am afraid updating to the newer OS would slowly down the machine itself and also changing my workflow. This is why I still use GS8 on it, I am afraid GS9 might give troubles on Sierra. Moreover, as you know I really spent times in the past for testing GS, now I do it but I would like to do it on a separate database as a sort of prevention agains any possible trouble (at least until the beta won’t end). I am too worried about corrupting my 27.000+ active listings database, it would be a nightmare to rebuilt…
This is in summary the reason of my actual situation. I really didn’t expect it would have created problem with the ebay token. I will upgrade also the second Mac to GS9, if there are no other solution. … aren’t they @paul ?