Where can I get the programs or dock image of MSMutTect and MSMutSig to download?
Unfortunately, those are not workflows we publish, so I don't know what programs or docker images they use. I do know that it is something the Cancer Genome Analysis group does, so if you know who to ask, you can ask someone from that group. If you do not, I'd recommend looking at the workspaces you mentioned in FireCloud and contacting the email address listed as the owner of the workspace. You can find this on the workspace's summary page.