Please choose which branch you want to install wisely. By default, to match the Cachet git repository, the L5 branch is selected.
Most of the installation errors are caused by errors in Cachet itself.
As mentioned on cachethq/Cachet, Cachet is still under development and things may break.
Noting the above, this particular Cachet installer has an autoupdate script in $OPENSHIFT_REPO_DIR/.openshift/cron/daily/autoupdate
Feel free to remove if you wish.