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SecureCRT actually supports "portable" configurations. You can install it officially and then set the "Configuration Folder" to a USB drive or a synced cloud folder, allowing you to take your sessions with you safely.
SecureCRT is favored by network administrators for its robust security features, which are lost when using an unofficial portable version: securecrt 93 license key github portable
Support for SSH2, smart cards, and GSSAPI. SecureCRT actually supports "portable" configurations