GUI (called seafile-client) is as well part of official Fedora repo, coming from here: https://admin.fedoraproject.org/pkgdb/package/rpms/seafile-client/
I’ll try to build it myself when I find some time for it.
I’d also like to share the bug report that I filed: https://bugzilla.redhat.com/show_bug.cgi?id=1395809