Dear Mathias,
From France, Paris I donwloaded :
MultiCommander v6.4.3 (Build 2232) (64 bit), version: 4 Aug 2016
You show the following checksum:
SHA1 : B04C003F3329B4AF6F12CC4BEF16D0A03B287B9D
I get for the file "MultiCommander_x64_Portable_(6.4.4.2233).zip" that comes with the download:
SHA1: 291C2A82CCAEB....
Have you forgotten to update the SHA1 on your side ?
Waiting for your confirm.
Thank you, and continue your excellent job