Depending on what you want to do with the checksum(s), you might also consider some other options as well:
1. If you only want to get the checksum of one or several files into the clipboard (as opposed to the checksums for ALL files in the lister columns), then there is the Clipboard COPYNAMES=hash and related commands. See the help manual for additional info on the different checksum types and output formats you can use with the COPYNAMES option.
2. If you intend to compare the checksum of a file to the checksum published on the website you downloaded the file from - OR - if you want to compare the checksum of 2 files against each other, then you might be interested in my HashCompare script.