If you open the browser developer console on the network tab, then do the installation, when it fails you will likely see the text go red. That will contain more information about what is causing the install to hang.

You could also look at your server error log and php error log. But I would try the above first. Unless you are very familiar with the server stuff, the browser developer console is a lot easier to get to grips with.

I really appreciate the response. i did as you said and this is the error I got: (I don't really know what to do about it or what it's saying other than there's a reference error).

Failed to load resource: the server responded with a status of 504 (Gateway Time-out)

install:1 Uncaught ReferenceError: registrar_frameset is not defined
at eval (eval at <anonymous> (jquery.js:2), <anonymous>:1:2)
at eval (<anonymous>)
at jquery.js:2
at Function.globalEval (jquery.js:2)
at m.fn.init.domManip (jquery.js:4)
at m.fn.init.append (jquery.js:4)
at showFailure (install:58)
at Object.<anonymous> (install:243)
at j (jquery.js:2)
at Object.fireWith [as rejectWith] (jquery.js:2)

I suspect what you report above may be a secondary javascript error reported in the console/log tab of the browser developer console, caused by a previous server error that may show up on the network tab of the developer console.

it seems the 504 gateway timeout during adding block types is a pretty common problem lately...