Is Reunion 12 a 64-bit app?

Reunion 12 is a 64-bit app. (It became a 64-bit app with the maintenance update released on February 26, 2018.) Any earlier version is a 32-bit app.

If you already have Reunion 12, just open your family file and choose Help > Check for Updates. This will ensure that you have the latest update of Reunion 12, which is a 64-bit app.

I'm seeing a message: "Reunion may affect the performance of your Mac."

Beginning with macOS High Sierra version 10.13.4 (released in the Spring of 2018), Apple started "alerting" users of 32-bit apps.

The only purpose of Apple's warning is to let you know that eventually (sometime later in 2018 or 2019 — there is no exact timetable) 32-bit apps may run slower than 64-bit apps and eventually may not run at all with future versions of macOS. Right now, there is no problem using the 32-bit versions of Reunion 12 or Reunion 11.

Will Reunion 11, 10, 9 (or older) be converted to a 64-bit app?

Converting a 32-bit app to a 64-bit app is a long and complex process, requiring large portions of the underlying code to be rewritten. Thus we do not plan to re-write older versions of Reunion. I.e., Reunion 12 is a 64-bit app; the older versions will remain as they are, 32-bit apps.

If you are still using Reunion 11 (or an older version) and you plan to keep updating your macOS, then we encourage you to upgrade to Reunion 12. Click here for details about upgrading.