Hello,
The oldest C4D version compatible is the last R10 build. However, we didn't test under Windows 7.
The license can be locked or floating. You can release it and attach to a different computer. This process have to do done manually because the option of online licensing that we have in Maya and Max is not persent in C4D yet.
The grooms can only be exported as Alembic. If the software that you want to use supports Alembic, the answer is yes. However this format holds the collapsed hair. There are no parameters to modify. It will export basic data like strand id, UVs, etc.
Jeordanis Figuereo (Product Designer. EPHERE Inc.)