The lastest trial version of Winstyles Theme Manager 1.5 is available here http://download.com.com/3000-2106-10222343.html?tag=lst-0-1
If you subscribe to ODNT you can get the latest released version of Theme Manager 2.09.014 by using SDC which manages all your software downloads for Stardock applications.
Once either version is installed, open it and read the help file which will explain how the software works.
Theme Manager/Winstyles by itself will not do anything, you also need the associated software for the theme you are trying to apply. Windowblinds, CursorXP, IconPackager, etc. There are trial versions of this software available here https://www.wincustomize.com/resources.asp?cmd=1
After you have all the software you need installed. If you are having problems getting Theme Manager/WinsTyles to download the necessary skins for the theme, which it will do if they do not exist on your harddrive, check your firewall settings to make sure that your letting TM access the internet