Thanks for your help! I'm just picking this back up and am still struggling.
It looks like the Brainnetome fsaverage isn't a full recon-all and is missing orig/orig.mgz. So @SUMA_Make_Spec_FS errors.
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++ Running @SUMA_Make_Spec_FS version: 2.2.4
++ will track 1 extra annot labels
failure: cannot find directory 'orig' or file 'orig.mgz' under .
program failure: exiting...
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I've also tried using SurfToSurf without luck...
SurfToSurf -i ld60 -i 164k/fsaverage.L.inflated.164k.surf.gii -prefix BN_ld60_lh
SurfToSurf -i ld60 -i 164k/fsaverage.R.inflated.164k.surf.gii -prefix BN_ld60_rh
ConvertDset -o_niml -i BN_ld60_lh.1D -prefix BN_ld60_lh
ConvertDset -o_niml -i BN_ld60_rh.1D -prefix BN_ld60_rh