I have checked, the missing files for MPI-ESM-MR/RCP45 are:

aps:
> aps_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210007010000-210008010000.nc
> aps_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210008010000-210009010000.nc
> aps_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210009010000-210010010000.nc
> aps_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210010010000-210011010000.nc
> aps_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210011010000-210012010000.nc
> aps_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210012010000-210101010000.nc

ta:
> ta_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210007010000-210008010000.nc
> ta_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210008010000-210009010000.nc
> ta_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210009010000-210010010000.nc
> ta_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210010010000-210011010000.nc
> ta_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210011010000-210012010000.nc
> ta_6hrLev_MPI-ESM-MR_rcp45_r1i1p1_210012010000-210101010000.nc