Hello,

If you have Windows XP x64 or Windows Server 2003 x64, then, unfortunately, Radmin VPN will not work. If you have another OS, then since the installer is not our product, then you can find a solution to this problem by following this link: https://support.microsoft.com/en-us/help/834484/you-receive-an-error-1603-a-fatal-error-occurred-dur...

i have window 10  and i was using your recommendation link but still it doesn't work
thank you for trying to help me but if you have  another method please tell me  

Hello,

Try this program https://support.microsoft.com/en-gb/help/17588/windows-fix-problems-that-block-programs-being-instal...

still it doesn't work  on this way. thanks for your suggestion anyways