Please use the firmware with the minimum version of 1.33. The firmware can be found at the Wiesemann & Theis website wut.de.
All necessary software modules are installed on the device already.
Please configure the ssl service for the VPN: Connect the configuration to the device, under "Station" "External Service Configuration" set a ssl password and start the service.
On the communication partner you can use PuTTY for a VPN and FileZilla for transferring files. Other ssl based VPN tools and other sftp file transfer programs can be used also.