Hi Sebastian
I fear that the reporting will not fully work on Windows-Servers, at least the part with PDF-generation using JasperReports (JasperReport Library). We won't be able to test this since we do not have any windows-installation. But you can try to create a Folder in Customizing/global/plugins/Services/UIComponent/UserInterfaceHook/ and unzip the https://github.com/studer-raimann/Reporting/archive/master.zip and install/activate the plugin in the ILIAS-Administration
If it works would be great to hear again – if not... well we will try to help you but as said we don't have windowsbased installations and maybe this will become quite tricky :-) but let's see
Best regards
Fabian