Forsome reason the prerelease beta version of Photo AI (which is what brianconnolly is asking about, given the date of his post) could only be installed on one device per qualified account. A qualified account was defined as a user with current licenses of all three apps: Sharpen AI, Denoise AI, and Gigapixel AI.
I think You should log out from your any one seat (1 out of 2 computers).
After this you can install Topaz in your 3rd compute, which will be your 2nd seat.
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