Toonboom can't be installed in another computer?

I bought Toon Boom harmony (advanced) back in 2016 (perpetual license).
I wish to install it on my work desktop in my job office.
Unfortunately, the installation process keeps getting interrupted saying I no longer have a valid Toonboom license or code, therefore it cannot be installed. (Which is very strange because I bought this version. It’s the full version, not a 30-day trial version).

What is happening? Please help.

Might help to copy/paste or screen capture the error message just in case there is something noteworthy being overlooked or misinterpreted however the perpetual license should allow you to do what you described.

This is just a user forum. You really need to contact Toon Boom support to resolve this.