It would appear that there may be a glitch in the install.php or some file that it calls. Both info33 and I saw the lockup at step 2. Both of us installed 2.0.15 (or upgraded to it from an earlier version). My localhost installation proceeded to Step 3 after refreshing the page, while info33's backtracked to Step 1.
My localhost has
Windows 7, installing with Internet Explorer 11
Apache 2.4.23 Win64
MySQL Server 5.6
PHP 5.6.27
BTW, (minor glitch) there is a misnamed file for the Admin page. The calling page wants to see:
\Themes\default\images\helptopics.gif, but what is there is:
\Themes\default\images\helptopics.png
I recently (18 Aug 2019) loaded the WampServer x64 v 3.17 onto my Windows 10 machine for localhost, but it needs some serious tweaking. I may just dump it and download the current versions of WAMP from their websites. SMF 2.1RC2 (from SMF Downloads) did install, but both the install and the forum are not what the coder(s) expected.