If you already have a previous version of XY Family Tree note this is not a new version of XY Family Tree but a completely new app that can import your XY Family Tree data and work with it as XML. Your original data remains safe if you prefer to use XY Family Tree.
Click the downloaded file (or find it and double-click it)
Click Run when you're ready.
If you're worried that it says the publisher is unknown you can contact me through the website and ask questions. Certificates cost money. XYFT is free. On balance a certificate is too expensive so you'll need to trust me when you download from this site. I'm not hiding - contact me with questions.
Then "Run anyway"
XY Family Tree © 2005 - 2018