You have to use the payware version of FSUIPC in order for ActiveSky to work with FS2004, correct? I think I read that when 04 was first released but can't find the info now. Thx.

Nope, the freeware version is set up to use with AS and FS04, but we do recommend the pay version.Hope this helps,JimActiveSky Support

Thanks. Are there features of A-sky that don't work with the freeware version?

No, but there are features of FSUIPC that are disabled in the free version. Also, we suggest to support Pete's efforts!Hope this helps,JimActiveSky Support