If I'm reading this correctly, the facility to Sync between Ancestry & FTM will cease from 29 March unless you purchase FTM 2017:
https://support.mackiev.com/244426-FamilySync-to-replace-TreeSync-in-FTM-2017• On March 29, 2017, Ancestry will be permanently retiring TreeSync® which is being replaced by Software MacKiev’s FamilySync.
• Between Wednesday, March 29 and Friday, March 31, 2017 syncing functionality will be unavailable as Software MacKiev and Ancestry deploy the new syncing technology.
• FamilySync will be available only in Software MacKiev’s Family Tree Maker 2017 edition, which is planned for release on March 31, 2017. No other FTM edition will sync with Ancestry trees.
• Ancestry’s search, merge, and Ancestry hints will all work as they do now in FTM 2017 for users who sync with their Ancestry trees. After March 29th these functions will no longer work in any other FTM edition.
• Among the new features of FamilySync is the ability for two or more computers in your home running Family Tree Maker, such as a desktop and a laptop, to sync with the same Ancestry Member Tree.
Pricing and Availability for FTM 2017
Family Tree Maker 2017 for Mac and Windows is available to pre-order today. If you purchased a Software MacKiev edition (FTM 2014.1 or Mac 3.1, both introduced on March 1, 2016) and have signed up for the FTM mailing list, you will receive a free downloadable upgrade by email. If you have NOT purchased a Software MacKiev edition or if you received FTM 2014.1 or Mac 3.1 as a free update, you can pre-order the upgrade from now until FTM 2017 is released for $29.95, and after release for $39.95. The price for those new to Family Tree Maker will be $79.95. All prices are for downloads. DVD and USB copies will be available for an additional cost. FTM 2017 is for both Mac and Windows, and the installer includes a choice of US, Canadian, Australian or UK editions.