Thanks for getting back with the Community, clarke01.

If you need to move QuickBooks to another computer, you'll initially want to confirm you've backed up your company file. Afterwards, you can deauthorize the old computer.

Here's how:
 

1. Go to your QuickBooks menu, choose Manage My License, Deauthorize This Computer. then select Deauthorize and Quit.
2. Re-open QuickBooks and follow the registration process. You'll be able to enter a different license if necessary. If you encounter any issues, refer to our Fix activation, license, & product numbers issues article.

After deauthorizing your old computer, you can restore the company file:
 

1. Double-click your backup file to open a new window showing a copy of the company file. If you've included attachments in your backup, you should also see a folder named Attachments Library.
2. Drag the copy of your company file to the folder where you usually store your company data. If there's an Attachments Library folder, move it to the same place.
3. Open QuickBooks for Mac and click Browse.
4. Go to your folder where you saved the company file copy, then choose it and hit Open.
5. A prompt will appear indicating you're opening a backup file. Press Continue.
6. Enter a name for your company file and select Save, then OK.

To restore attached documents, refer to Step 3 from our Restore your backup company file for QuickBooks Desktop for Mac article.

In the event you need assistance with these steps, or encounter problems while performing them, you can get in touch with our Customer Care team. They'll be able to pull up your account in a secure environment and guide you through the process. They also have the ability to do screen shares if necessary.

If there's any additional questions, I'm just a post away. Have a great Thursday!