Trojan remover fails to update the program

Hi there,
I meet all the system requirements from the error message below and still it doesn’t want to work. I don’t know what to do anymore so can put this on work. Any solution ? Can anyone tell me please why is not working ?
Thanks !

TR 6.8.3 – Error
Program Update Required
You are currently using Trojan Remover 6.8.3. This version
is not compatible with the latest database update – you need to update the program to version 6.8.8 or higher.
You can do this either by clicking on the Update button on the main menubar (ensure you are connected to the Net)
or by manually downloading and installing the Program Update available from the Updates page at: www.simplysup.com
