Question

The VisVAP GUI is in the wrong language, how can I change it?

Answer

The language can only be changed by a new installation. Your VisVAP is in the wrong language, because this was selected during the installation of PTV Vissim.
We recommend installing PTV Vissim again using the current setup: https://cgi.ptvgroup.com/php/vision-setups/?lng=en&view=all.