Evon,
Rebecca and Robert are correct. I just installed the Web AppBuilder Developer Edition 2.0 on my office PC. Took me some time to figure it out, but the write up by Tapas Das was the best solution to helping me figure this out:
Installing Robert’s Enhanced Search Widget for the Web AppBuilder
He provides a step by step instruction on exactly what you need to do with an excellent example.
Some helpful info, which I found confusing at first, was the proxy thing; if you do not have a proxy it is easier, but if you do Tapas Das explains what you need to do in the link I provided.
Also, remember the Web AppBuilder Developer Edition 2.0 is installed on your local computer. All your app building will be done here. Then once done, you can zip the app you just made and move it to your server machine.
Also, if you are working on your Office PC, then you need to be sure to include the name of the computer AND the domain in the address when you install the Web AppBuilder. Tapas Das mentions LocalHost:3344 in the document, but this is only useful if it is on your home computer. Your office computer name {domain}:[port] should look something like this: my-office-computer.mydomain.net:3344 OR myofficecomputer.mydomain.com:3344. "3344" is the Port. You will most likely always use 3344.