I bought WiFi Guard. It is a great tool and is working fine.
As the license allows to install it on a second machine, I thought I make an export of my device list and import it to the second computer. But the export ends with this error every time I try: "Unable to create file /Users/.../Documents/WiFi.xml". Same happens whether I export CSV or XML.
I bought WiFi Guard via Apple AppStore, version 2.1.2, using it on macOS.
We have just re-tested the export function in the latest version (2.1.2) and the file was exported successfully. Here is a couple of reasons why the error may be happening on your mac:
Apple AppStore apps run in a sandbox and it may prevent the app from writing and reading external files in user-specified locations. If that is the case, try searching your entire disk for WiFi Guard.DB. This file can be transferred to the new machine to replace the existing database.
There may be incorrect permissions set for your User and/or Documents folder. Try saving the XML file to a different location, e.g. a USB stick. Alternatively, you can try correcting macOS permissions.