Based on the context provided, which points to the by the University of Tsukuba, Japan, and the open-source SoftEther VPN client,
Ability to switch between SoftEther, OpenVPN, L2TP/IPsec, and SSTP.
Note: The query mentioned "crack" or "full download," but official VPN Gate software and the SoftEther VPN project are free and open-source, eliminating the need for such methods.
1. Abstract