Thanks for dropping by here in the Community, Marthad.

There are two ways to move your company files into the newer version of QuickBooks. You can either run a back up for each company files and restore them manually or upgrade into the 2020 version the first time you open the program.

Since some of the companies aren't imported, I suggest opening the older version of the program and create a copy. Here's how:

1. Click the File tab at the top menu bar, and select Back Up Company.
2. Hit Create Local Backup.
3. Choose necessary options.
4. Press Finish.

Check out this sample screenshot:

To restore the backup on your newer version, I recommend visiting this article (scroll down to Solution 1):

Move your company files to another computer.

For additional insights into the second method which is upgrading the program directly within QuickBooks 2020, I'm attaching the support link below:

Upgrade your company files after installing to a new version of QuickBooks Desktop.

Please let me know if you have any other issues or concerns about the company files. I want to make sure everything is taken care of for you. Have a great weekend ahead.