Using image 7.5 there is a problem with Wireguard vpn:
the plugin is installed correctly using "plugin menu" or manually via telnet, but then the plugin does not appear in the list of installed plugins

oops, sorry. I didn't know, but I also have a similar problem with the Hdf 7.3 release, when I try to update Wireguard from release 10.1 to 10.8