The update check from the System pref pane reports that version 3.3.8 is available but then downloads 3.3.7.
The current version would show 184.108.40.206. Install the file and see what it says. Perhaps the .dmg is just mislabeled.
Download from this link and tell me what the installer says. It shows 3.3.8 for me
The installer downloaded by the Flip4Mac System pref pane is version 220.127.116.11 when run from an install of 18.104.22.168
You might want to correct the incorrect behavior of the updater checker...
Yes, the 3.3.8 download is available by seeking it out from the website.
Tim please do report the issue when using the internal Update check. Flip4Mac Support Form