Cable needed to download software from Mac 21 in.-2011 to MacBook Pro 13 in.- 2017

The first thing is that it depends on a) the version/age of your Word app and b) the license - you may not be able to use it on a new OS as it may not be compatible or the license can't be used on another computer. So, check your Word version and see if the system requirements say it's compatible with your new OS; also check and see if the license can be used again. And, make sure that if you need a newer version of the Word app it can read the docs created with the old version.

You do not need a cable or transfer anything for your printer. When you hook it up to the new Mac, simply go to System Preferences > Printers + Scanners and click on the + sign to add it. It should then download/install the drivers needed....... unless it is too old and not compatible with the new OS either. I just checked and it appears to be ok as there is a driver listed for OS 10.13 which you can download manually if the OS doesn't do it for you automatically.

https://epson.com/Support/Printers/All-In-Ones/Epson-Stylus-Series/Epson-Stylus- NX430/s/SPT_C11CB22201?review-filter=macOS+10.13.x

Now, as far as your files/documents are concerned, you should be able to use the screen sharing method or try a less troublesome way which would be to use a USB stick or external USB hard drive, plug it into the old Mac and drag/drop your files onto it. Then plug it into the new one and copy over your stuff.

FWIW, the easiest way to to connect two Macs would be with Firewire; if your old one has it, then all you'd need is a FW > Thunderbolt adapter and plug that into the new one. Using that, you could use Migration Assistant.

If you can get each of these Macs onto the Internet without re-cabling, you already have a connection between them -- through the local SWITCH function of your Router (this does not use the Internet).

System preferences > Sharing > File Sharing...

... will immediately allow access to this folder on each Mac:

/Users/<Main-user>Public Folder

... and if you work harder, you can get access to additional folders such as:

/Users/Shared

If you've acquired the software from the app store, you can simply re-download it on the newer Mac directly.

Or exactly what is it that you are trying to accomplish?

You're very welcome! That's what we get the big bucks for.... just kidding (we're all other users/volunteers here).