In the mt4 official website download mt4 (https://metatrader4.com/zh/download), after the completion of the installation found directly into the mt5:

I have to say that Metaquotes official promotion of mt5 is really spare no effort, the need for real mt4 client can only be downloaded through the link given by the trader platform, the following directly given Rexxon mt4/mt5 download address.

[MT4] https://download.mql5.com/cdn/web/swissquote.bank.sa/mt4/swissquote4setup.exe

[MT5] https://download.mql5.com/cdn/web/swissquote.bank.sa/mt5/swissquote5setup.exe