If you can still write to Google Code, you should mention that https://code.google.com/archive/p/neompc/ is an out of date repository. Its last release is 0.5.2 which date from Jan 8, 2008.
As Google Code is now named Google Code Archive, you might not be able to write there. You should then mention on the README file of this repository that the Google Code repository is out of date.