Opponents can't view my replays

[Crossroads]

Not sure what's going on with others not able to see your replays...?

However as for number of installs, you only need one. At the time 2.00 came out, and folks had for instance PBEM games going on with 1.04, we recommended to keep the old and to install the new into a new location.

Not really required anymore. I recommend running the uninstall function on 1.04, so that the Windows registry entries are gone. If a 1.04 folder still remains after the uninstall, that's the stuff you've place there after the original install, and you can then remove them manually.