I am not given authority to open a project file in Pro Premium. This is probably more a Windows problem but anyone might crossed this problem. The files are made in a version of Pro 16 Plus and I have just updated to Pro Premium. I must get in touch with administrator or owner of "object" but that is myself (!) so this is something ahead of my knowledege for the moment. I am using Windows 10. I did not have this problem with files made in Pro MX Plus DLV
Gunnar/Sweden