What version of Quicken are you running?
Is your subscription still active?
You can get this information from Help > About Quicken.
Have you given Quicken plenty of time to "work through" that "blank window?" Occasionally I'll get that blank window for whatever reason but, eventually, the file shows up.
The "blank window" you're receiving is the prompt for the Quicken ID and password. You get it because you moved your Quicken data file to a different computer. Normally, after a few seconds, the window builds with the necessary information. However, if a Windows or a third party Antivirus program or Firewall blocks Quicken from accessing the Internet, this may not happen.
Is Windows Defender Controlled Folder Access enabled? If it is, configure it to add Quicken as an "allowed app" without turning off Ransomware protection. Perform these steps
To update to a newer version - if you wish to - you can go here: https://www.quicken.com/support/update-and-patch-20182019-release-quicken-windows-subscription-product
But the problem might be related to the "annual subscription" situation since that release was issued last May, so you could be right around the time of subscription expiration. Do Help > Manage Your Subscription on the old machine and see what that has to say.