There is a minor change on the Partner Portal in where you can find the right software versions for OpenScape Business.
In case you want to download a Hotfix (HF) version you have to go to the GA version (see 5), then under Production Version you will find all version, Hotfixes included.
Examples for Osbiz V2 and Osbiz V3
OpenScape Business V2
OpenScape Business V3