Trojanhelp has an in-built updater to update virus removal and scanning definitions, and as of version 6.2, the main Trojanhelp program as well (if there is a new version). This requires you to have access to the internet. If you still cannot update it is either a problem with program or something is blocking the internet updating process e.g. Firewalls, non functional or no internet connection. If so then please check them.
If you are having more advanced problems then please feel free to email the technical details at [email protected]