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There is no 32 bit MT5. You must have a 64 bit OS. MetaTrader 5 build 2190 was the last release that supports the 32-bit version.
Support for 32-bit versions ends with the next MetaTrader 5 update - MetaTrader 5 - General - MQL5 programming forum (2019)
There is no 64 bit MT4. All 64 bit OS can run 32 bit executables. Since 1 January 2018: completely stop support of all operating systems, which are lower than Windows 7
32-Bit vs. 64-Bit Operating Systems for MetaTrader 5 (2017)
There is no 32 bit MT5. You must have a 64 bit OS. MetaTrader 5 build 2190 was the last release that supports the 32-bit version.
Support for 32-bit versions ends with the next MetaTrader 5 update - MetaTrader 5 - General - MQL5 programming forum (2019)
There is no 64 bit MT4. All 64 bit OS can run 32 bit executables. Since 1 January 2018: completely stop support of all operating systems, which are lower than Windows 7
32-Bit vs. 64-Bit Operating Systems for MetaTrader 5 (2017)