The patch can be installed on all g3 versions and is available for all languages. It's only for original G3 game, not for Forsaken Gods.
The CP 1.74 contains all previous patches. So you need only this patch to update Gothic 3.
1.7x savegames are compatible with CP 1.74. Older savegames (1.60 or earlier) are not compatible.
Choose only the option "Activate ATI/AMD workaround for shadow problems" at the end of the installation if you have a 4xxx/5xxx ATI card. This workaround can be activate/deactivate in the ge3.ini
If you have installed modifications then save it before installing the patch. The patch will delete all superfluously files during the installation. We can't guarantee that all modifications will work with the CP 1.74.
If you have installed the quest pack then you should install it again after the 1.74 installation. The current quest pack version will has some minor issues because of missing stringtable entries (English quest pack version is in progress and follow soon).