After logging in with Gmail, the buying option is not working. Please fix it.
Whoever is in charge of handling the updates for sign-in through the desktop app should be fired. This issue has become an on-going issue every time any sort of update happens.
Are you trying to sign up for a new subscription plan for Topaz Video or purchase an older license to Video AI?
The older perpetual licenses and update plans for Video AI are not for sale via the website, if you are looking for that option you will need to email the support team directly. help@topazlabs.com