We apologize for this and will release this puzzle after we have posted an update to main.
For now, if you would like to play around with it, we have moved it back to the "devprev" update group.
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Q: How do I try out the Foldit Developer Preview?
A: Locate your Foldit data directory (see next question). Open the file options.txt and change the update_group variable from "main" to "devprev".
Q: Where can I find the Foldit data files?
A: The data files are in different places depending on your OS:
on Windows:
if you installed after 8/23/2011, they will be in your installation directory (the default is C:\Program Files\Foldit\ or C:\Program Files (x86)\Foldit\)
if you installed prior to 8/23/2011:
on Windows XP at C:\Documents and Settings\All Users\Application Data\Foldit\
on Windows 7 and Vista at C:\ProgramData\Foldit\
on a Mac, Ctrl-click on the app and choose "Show Package Contents, then go to Contents/Resources
on Linux, is is the Foldit directory
Q: I've had enough of the preview! How do I go back?
A: In your options.txt file (see question on how to try out the Preview), just change your update_group variable back to "main" from "devprev".
Unrecognized setup options specified: replonly