Direct download links for the specific are no longer publicly hosted by Tukatech because they have transitioned to a cloud-subscription model that always provides the most recent version of the software. Users are encouraged to stay current via the TUKAupdate portal . Official Download & Subscription Process
If you bought TukaCad 2017 physically, check your original DVD or external hard drive. Many professionals keep offline backups of mission-critical software. tukacad 2017 download link