corker: you should have posted it earlier as I've already uninstalled v4.0.0.34 and re-install v5.0.0.17 as there is no guideline on upgrading/updating details of the software in their website. You should remind them to provide such details to avoid unnecessary processes.
They quote that valid license can use it for upgrading from version 4 to version 5. Hope you can confirm with Bitsum Technologies on that.
Many thanks!