The primary change in Hero Lab 8.9 is 64-bit support for both Windows and Mac platforms.
For Windows, both 32-bit and 64-bit versions are installed, and users may use either. Unless your version of the operating system disallows it, we recommend the 64-bit version for all users, however either may be used and you may even swap between them if necessary.
For the Mac, the 32-bit version has been retired as it is incompatible with the latest operating system (10.15 Catalina), so you only have the 64-bit version.
For Windows, both 32-bit and 64-bit versions are installed, and users may use either. Unless your version of the operating system disallows it, we recommend the 64-bit version for all users, however either may be used and you may even swap between them if necessary.
For the Mac, the 32-bit version has been retired as it is incompatible with the latest operating system (10.15 Catalina), so you only have the 64-bit version.