How can you open your project with lower version editor with your Unity Industry

Symptoms:

• You are trying to open a project of 2019.4.27 and lower, or 2020.2.2 and lower
• You are upgraded to a Unity Industry license
• When you try to open the project, a screen appears requesting you to enter a serial key

Cause:

Older versions of Unity Editor(2019.4.27 and lower, or 2020.2.2 and lower) cannot interpret named user licenses, such as Unity Industry licenses.

Resolution:

To resolve this issue, follow the instructions below:

1. Launch the Unity Hub
2. Click the account icon in the top left of the window and sign in to your Unity ID
   
3. After you are signed in, click Preferences (cog icon)
   
4. Click Licenses > Add license.
   
5. Select Activate with license request.
   
6. Select Create license request and save the file(Unity_lic.alf) to the chosen location on your computer, such as your desktop.
   
7.  Click the license.unity3d.com/manual link to open the manual activation page. If prompted, log in with your Unity ID.
   
   
8. On the Manual activation page, click Browse and select the license request file(Unity_lic.alf) from the location you saved it in step six.
   
9. Enter your serial number and click Next.
   
   
   Note: You can get the serial number on Unity ID -> My Account -> My Seats
   

10. Click Download the license file and save the .ulf file to your computer.
    
11. Open the Unity Hub’s How to activate an existing license window (Preferences > Licenses > Add > Activate with license file).
    
12. Click Activate.
    
13. Your Unity license is now activated and now you can open your project as usual.
    

More Information:

If you continue to receive errors, contact Customer Experience with your log files.

Relevant Articles:

I upgraded to Unity Industry but now I can't open projects created in Unity 2019.4 and below.

How do I activate or return my Unity Industry license?