@SiWorkshop @LauraB77 

I had more than 7 versions of QBD installed on my machine (Win 10 Home 21H2 build 19044 on 8GB RAM protected by a cloud based endpoint security solution) as of last June. Every time I open one version, it took more than 10 minutes to be ready to open the file. One day I couldn't open any of them and got the same error message regarding license issues. I suspect it's related to QB server to force QBD update including outdated version to be integrated with Intuit ID. I had to reinstall QBD 2021 and 2018 in new folders, and miraculously I can open any of them in less than 10 seconds ever since. I would suggest reinstalling your QBD and creating a new folder. If the same problem persists, try to disable your endpoint security to see any difference.