Hello,
I updated Zerotier from 1.8.4 to 1.8.5 on Fedora 35 and I was having problem starting the service, I was getting this error
/usr/sbin/zerotier-one: error while loading shared libraries: libssl.so.10: cannot open shared object file: No such file or directory
The only way I could fix it was to install compat-openssl10 which is not available anymore on any of the official repo for Fedora > 33.
I have used the one from those repo and it seems to work
https://copr.fedorainfracloud.org/coprs/dioni21/compat-openssl10/
Edit: I should mention that apparently 1.8.5 was problematic (Windows version 1.8.5 - #3 by rlcronin), but was still in the repos