Plesk upgrade fails with error:
Fatal error during packages installation: Test Transaction Errors: package libarchive-2.8.4-11042015.x86_64 (which is newer than libarchive-2.8.4-6.el5.i386) is already installed
epel repository is enabled on server.
Plesk internal issue with id PPPM-4006. The fix is considered to be included in future Plesk updates.
epel repository in
/etc/yum.repos.d/epel.repo like below:
[epel] ... enabled=0
Start upgrade again.