I am having the same issue. New user. Can someone explain how to install the files manually? I tried copying to /mnt/user/appdata/myVPNServer/easy-rsa/ but nothing happens when i refresh.
EDIT: I managed to get this working. The correct path for anyone that wants to do install easy-rsa manually is:
/mnt/user/appdata/myVPNServer/easy-rsa/easyrsa3/
I moved the contents from the extracted folder to the above location and then it pics up the installed version and can proceed.