between Upgrades at 75% and Upgrades at 50%?
If your version is the previous version of the current product, the upgrade can be done at 50% of the current product price. Ie) PDF Converter Standard 2.0 to PDF Converter Standard 2.1. If the version you own is older than this, 2 or more versions prior to the current one, then your upgrade can be done at 75% of the current product price. E.g.) PDF Converter Standard 1.5 to PDF Converter Standard 2.1.