Read here: https://support.mackiev.com/498640-RELEASE-OF-FTM-2017
FTMMac v2 and v3 can still be used on a compatible computer, as a DESK-TOP ONLY (NOT on-line) genealogy program. Only FTM2017 is "on-line" capable, meaning it can interface with Ancestry.com.
To utilize the on-line tree functions of FTM2017, it requires* (ie; mandatory) the tree to be uploaded to Ancestry.com. This was not required before FTM2017. There is no work-around, but you can make the tree on Ancestry.com "stealth" to the public/internet, by choosing "private and not indexed" in the tree settings. The data of your tree will still be used by Ancestry for purposes unknown.
Go directly to mackiev.com to purchase FTM2017 or upgrade to FTM2017 (the offer to upgrade older versions may not be available).