Why would you downgrade from 5029 to 5028 ? It didn't update Conquer.exe.
However if you really want to downgrade do this :
- Get patch 5028 from site
- Put in Conquer folder
- Run it & Let it patch
- Open taskmanager and close the autopatch before it downloads the new patch
- Open up version.dat in conquer folder
- Change what it contains to 5029 (It won't patch till next patch comes this way.)
- Run play.exe and play normally