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64-bit applications need a 64-bit edition of Windows or macOS for them to run. 32-bit applications will work on both 32- and 64-bit editions of Windows and macOS.
The simplest way of finding out if you have a 64-bit system is to try installing a 64-bit download from this web site. Alternatively:
This Microsoft article shows you how to find out whether you have a 64-bit edition of Windows: support.microsoft.com/kb/827218
To find out whether you have a 64-bit edition of macOS: