haven't used shell commands in 12 years an need help

[dave3755]

I've been out to the industry for 12 yrs and forgot most of what I know.  THe issue is I stored alot of data up on google cloud back in '19 and now want to retrieve it.  The upload interface was great the download interface is non existant.  What I need it the command to copy all files and directoried under the pictures3755 bucket to the local path e:\.  and detail intructions of where to launch the shell which shell etc. I just wanted to use it for BU storage but this isn't working out.  Thanks for your help