I got a response:
Thank you for your report. We are aware of the issue and will update GPG key not earlier then on Monday. As for now - you can install it directly from RPM file if you want. Here are the commands to do it:
wget https://download-cdn.resilio.com/2.5.9/RPM/resilio-sync-2.5.9-1.x86_64.rpm
This will download the file locally and then:
rpm -i resilio-sync-2.5.9-1.x86_64.rpm
This will install Sync. Sorry for inconvenience caused.
If you'll have another issues or suggestions - please contact us freely.
Have a nice day, merry Christmas, happy New Year and thank you for using our product!
Best regards,
Dan Ivanov,
support engineer