After updating Lightroom CC 2015.9 and Camera Raw 9.9 I still receive an error when opening my RAW files from the Fuji GFX 50S: "the file appears to be unsupported or damaged". This camera was a pre-production model. I heard this might cause the error. Can Adobe fix this soon?
Your Fuji GFX 50S likely has outdated firmware. You should contact Fuji to obtain the latest firmware from your camera and get it updated so that Lightroom can read your files going forward. Adobe only supports the shipping version of the raw files from any camera manufacturer and cannot help with files from preproduction models that vary from the final spec.
A little bit more detail: If you are seeing this error message while importing photos shot with a preproduction unit of Fuji GFX 50S camera with firmware versions 128 or earlier, Lightroom will not be able to read those photos because of incompatibilities in the firm ware.