That 32 is the depth. 16-bit and 32-bit are the only choices.
The MA3 code itself is a 32-bit program, though it will run fine on a 64-bit machine. The only difference in the install package would be where it puts the program on your computer. 64-bit Operating Sysems sometimes prefer to have 32-bit programs in special folders if they are to be used as Screensavers. You could just download the file from this Forum, and put it wherever you want.
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