Even though most modern PCs run 64-bit Windows, many brokers still offer the 32-bit version of MT5 to ensure compatibility with older machines (Windows XP, Vista, 7 32-bit) or older VPS servers.
Here is the key information regarding mt5setup.exe (32-bit): mt5setup.exe 32
It sounds like you are referring to the for a 32-bit system. Even though most modern PCs run 64-bit Windows,