The xshell 5 that is being used cannot be used, and it is prompted that the evaluation period of xshell 5 has expired, and reinstallation still does not work. In fact, xshell 5 has a free version, that is, the Home & school version. Uninstall the original program, download and install the free version of xshell 5.
Link for free version: http://www.netsarang.com/download/free_license.html