I am trying to uninstall the client from the command line to be able to install the new 19.1 without much user interaction but when i run it with the "/uninstall //" command line it fails with the message that "Another version of this product is already installed>" (of course, that's why I am trying to uninstall it)

from the help:
/uninstall //

Uninstalls DataFlex. Note that the // is important (and needs to be included). This option can only be combined with the silent and logging arguments.

This is the command line I use:
"DataFlex 2019 Client" /uninstall //
Thank you!