All institutes listed on www.mpg.de can download the software here:
The Windows ZIP files contain the MSI resp. DMG installation file and the license file. Both must be unpacked into a common folder. The installation can then be started.
If you can not access the download files, please contact the Software Licensing Group (MPDL), firstname.lastname@example.org, and give them the IP addresses of which the download is to take place.
For more information about EndNote and other reference management systems, see https://www.biochem.mpg.de/7026395/EndNote.