Oracle Presenter Screen

I have the 64-bit 11.4 gnome and I want to install the oracle presenter screen because it is great for my presentations with LibreOffice Impress. However, when I download the extension and try to install it I get the error “extension does not work on this computer”. What is going on here? I have used Fedora and Sabayon (64 bit gnome systems) before and they all came with the presenter screen installed by default and it worked. Why can’t I install it on my computer?