Thank you Kristian for your help. I just discovered that when you invoke “open library folder” from GS help menu, it actually does not open the real com.iwascoding folder, but a sub-folder with the same title. So I wrongly moved it into the subfolder. Now I put it directly in container and everything worked fine! GS 9 launched good and I will do some testing next days. I will especially see if I can work on it with TeamViewer. I will start with work as soon as the out of stock bug will be fixed or a workaround will be found (I mean this Issue with multiple quantity listings and auto relist feature - #15 by ilja ).
Thanks again for help
Federico