Hi Stefan,
There is a DB connector that can export information from Agile Central into a CSV file. You can learn more about it here: CA Agile Central Database Connector (Postgres) | CA Agile Central Help
However, one option you may want to consider is creating a dedicated Excel 2013 machine (which is supported by our current 2.4.4 Excel add-in) and share it between you and other colleagues. You can RDP into that machine. It won't be on each person's desktop/laptop but it's still an option for you to consider to use the Excel add-in.
About Excel 2016, it will be supported in our next version. Here is a discussion thread where it's mentioned, but there isn't a release or a beta date yet:
Excel Add-In for Mac OS?
Thanks,
Sagi