Welcome to the Cryptomator Community 
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There is none, which works. At least no for any 1.6.x version.
Windows 7 is offically not supported by Cryptomator 1.6.x. You need to update your OS in order to run it, or, if you are unable to do so and already migrated a vault, perform a downgrade and stay on the latest 1.5.x version.
Regarding the portable app: As stated on our download page, “the portable app is a community effort and not officially provided and maintained by Skymatic”. You should contact the maintainer and inform them about this mistake.