How to install specific version of package in DNF

How to install specific package version in DNF. One of my installed package installed the new version, but this new has some issue, then I want to rollback to the old version, but the last old version of the package is still on fc25. I tried to add the specific version when tried to reinstall but without success. I add this at the end of the package name

-1.fc25.noarch

and some other combination. BTW I am on fc26 and the package can be found on the copr. Thanks