@ lansing - you can download with a download manager like jdownloader2 (useful but very bloated software, make sure you get the ad free version)
The red channel is almost non-existent. (e.g. convert to RGB and use showred) . Difficult to make it look realistic
You can try some weighted average of G,B +/- manipulations to reconstruct the R , but it won't look "real". It will look off
preview of R,G,B