[Koha] koha 3.0.0.0 beta

Re installing Koha 3.0.0. beta version on a Windows platfrom Have downloaded the three modules - Apache, Active Perl and MySQL but the download of Koha-3.00.00-beta2 won't install. As far as I can see, the set-up executive is not there. the file is in a tar.tar form, but even when extracted I cannot find the set-up executive. Can someone please help? Carmel. Am using this version because read somewhere that the Z39.50 function doesn't work on koha 2.2.9 on a Windows platform? Or has this ben fixed?