(<edit> removed as it came up as invalid.)
Just choose the manual activation options rather than the online one. This worked for me. Let me know if it doesn't and I'll try to find the source I got these from again to see if there's another alternative.
Using the LZ raw demosaic in basic linear mode, saving to tiff and processing the tiffs in ACR is now my preferred method of processing the Fuji raw files. Aside from the slight delay in selecting the raw files and applying the "Style" that I have saved to convert and save them all to tiff in LZ, processing is just as quick as with normal raw files in ACR. If space is a problem, you can delete the unused tiffs afterwards if you save the xmp files that ACR generates to a separate folder beforehand. It's straightforward enough to redo them if need be by simply redoing the LZ base process and directing the saved tiffs into the folder with the previous xmp files, which should then re-associate with the regenerated tiffs and apply your previous corrections.
Edited by Fred Nirque, 01 February 2013 - 06:00 .