Did a search and found one for free.

Not that bad. I mean the videos only come out as good as they go in. Meaning if the flash video is junky, the video will be junky.

here is the disclaimer and links located in the read me within the zip file that the converter is in

Name: Pazera Free FLV to AVI Converter
Version: 1.1
License: Freeware (for commercial and non-commercial use)
Date: January 5, 2008
Author: Jacek Pazera
E-mail: jacekpazera@wp.pl
Web page PL: http://www.flvtoavi.glt.pl
Web page EN: http://www.flvtoavien.glt.pl

////////////////////////////////////////////////////////////////////////////////

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

////////////////////////////////////////////////////////////////////////////////

There is another File within the zip , turns out to be a codec pack.

Zip is

“Pazera Free FLV to AVI Converter 1.1″. Took all of about 10 minutes to confert a 45 minute flash video.