[xwiki-users] Can't install extensions

Hello, I have recently installed XWiki Enterprise 4.3 Standalone on Windows Server 2008 R2 and am unable to use the extension manager. Any extension I browse to, whether installed or uninstalled, does not respond to the show details or install buttons. I click the button and nothing happens. There are no messages logged in the console either. I thought I could work around the issue by importing the xar files directly, which I did for both the ldap extension and the forum extension. The forum extension appears to be functioning even though it isn't listed as an extension or anywhere else except on the dashboard. Is this the correct behavior? The ldap extension also seemed to work, but it doesn't actually authenticate a user. In googling around, I fear that the extension dependencies aren't installed, but I'm not sure how to check that or what the dependencies are (I don't see them listed) to attempt manual installation of them. LDAP does show up under applications in the admin menu, and I've gone through and tried configuring it both there and in the xwiki.config to no avail. I'd prefer to get the extension manager working so that we can easily install/uninstall extensions as needed, but any help with either the extension manager or getting the ldap extension to work are greatly appreciated. Thanks for reading and any suggestions you may have! Barry