Internal error: The Windows Installer for this product component did not run as expected: InstallExecute.

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I've tried to uninstall the 2015 version and I just cannot get 2016 to work...

different drives, anti-virus, permissions, delete registrations, turn off UAC... I've touched enough for that.

Can anyone give me a solution? Thank you !

[E   158 1     MSIInstaller.cpp(3246) 21:56:36] $S21:56:36 Error Status 158 0 "***END DUMP OF WINDOWS INSTALLER DATA***"

[E     0 1     MSIInstaller.cpp(3191) 21:56:36] ** Install FAILED with code 1603

[E   154 1     MSIInstaller.cpp(3192) 21:56:36] $S21:56:36 Error Step 154 0 "** Install FAILED with code 1603"