Hi,
Fresh fedora 22 workstation install just to test this new release in a VM machine,
same problem as JohnCall:
[root@localhost ~]# dnf install ~terrence/Downloads/insync-1.2.13.35166-fc21.x86_64.rpm
Warning: failed loading ‘/etc/yum.repos.d/gtk-theme-config.repo’, skipping.
Last metadata expiration check performed 0:26:03 ago on Fri Jun 19 00:35:33 2015.
Dependencies resolved.
Package Arch Version Repository Size
Installing:
insync x86_64 1.2.13.35166-fc21 @commandline 62 M
Transaction Summary
Install 1 Package
Total size: 62 M
Installed size: 156 M
Is this ok [y/N]: y
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Installing : insync-1.2.13.35166-fc21.x86_64 1/1
Error unpacking rpm package insync-1.2.13.35166-fc21.x86_64
error: unpacking of archive failed on file /usr/lib/insync/isyncd.commands-0.2.6-py2.7.egg: cpio: rename
insync-1.2.13.35166-fc21.x86_64 was supposed to be installed but is not!
Verifying : insync-1.2.13.35166-fc21.x86_64 1/1
Installed:
insync.x86_64 1.2.13.35166-fc21
Complete!
The rpm does not install! 
!!! PLEASE !!! install a fresh Fedora 22 Workstation image in a desktop VM solution and test before rolling new packages intended for release…
Using your customer base for quality assurance like this is going to damage the reputation of your product in the long run…