We provide an older version of Mikogo for Windows XP. You can download it here: https://download.mikogo4.com/win_5_3_1/Mikogo-starter.exe
The portable Mikogo version for terminal server can be downloaded here: https://download.mikogo4.com/win_5_3_1/Mikogo-host.exe
Please note that Windows XP is not supported by its provider for years. Thus, we can not guarantee a compatibility with Mikogo.