I just purchased the Radio Shack 33 0099 Digital SPL meter. Under the downloads section, I see the calibration file for the digital SPL meter is for another model. Will it still work with the 33 099 model?
No, the meters look to be sufficiently different that the old digitial meter cal file is not appropriate - safest to just check the "C weighted SPL Meter" box to have REW correct for the C weighting. There is more info in this thread.