Hi Anneli,
The 'Upgrade' installation differs somewhat from a 'Service Pack' installation. The main difference is that an 'Upgrade' install requires an install code and serial number, whereas service packs simply require a password to run the EXE. Upgrades are the first release of an Adagio application where the version number changes (such as 6.8B to 8.0A); typically there are a number of new features and enhancements included in an upgrade, where a service pack usually has minor enhancements and program fixes.
Upgrades are not downloadable from the web, and Service Packs are. To install an Upgrade, you need to use the link on that email you receive to do the download the Upgrade. I believe the format of the downloaded file is a ZIP file, which needs to have the contents extracted with WinZip or the Windows XP extraction tool before you can use it. Within the email should also contain the serial number and install code you need to install the Upgrade.
Upgrades are a little different because only customers like you who have subscribed to the Upgrades Support Plan can get Upgrade notices.
If you still are having problems, let us or your Business Partner know.