I had a problem with Roon (related to TIDAL) and thought to deinstall the whole Roonserver App and reinstall it might be worth another try. But now, after deinstalling Roonserver, I am not able to reinstall it again. There is a shared folder named roonserver on my Synology NAS (in fact, on an external SSD that is attached and where Roonserver was installed before and worked). But the installation of the SPK file (provided by Christopher Rieke) stops with the following message:
/tmp //could not download installation archive from roon labs website. please check your internet connection
The internet connection is certainly not the problem.