Yes, of course, these are demo version audio drop outs. Please purchase the plug-in's license to transform the demo version of a plug-in into the normal (purchased) version.
You do not need a key to try the demo version of any Voxengo software product. The product runs in the demo mode until you authorize/register it with the purchased product key.
ZIP (DMG on Mac OS X) file we provide contains module file which is a plug-in module - it can only be loaded in audio host applications that support VST (AudioUnit on Mac OS X) plug-ins (e.g. Steinberg Cubase, Apple Logic Pro, Ableton Live, Cakewalk Sonar, etc). Please follow the "Download type & How to setup?" instructions presented together with the download link in order to install the plug-in correctly. If you are on Windows, also make sure to download a correct (32-bit or 64-bit) version of the plug-in to match your audio host application's bit'ness.
Please visit the User Area page and download setup files for products you paid for. Even though they are labeled "Demo" after installation, you will be able to transform them into fully working versions by entering the corresponding product keys. Note that the exact authorization routine is described at the User Area, via the link placed next to the corresponding product key.
User guides (manuals) are presented in the form of PDF documents on individual product pages, and are also distributed together with application files.
You may download the previous version via the User Area only. If you do not see it listed there you should first use the "Add Product Keys" function to add your product key to the User Area.
Running Ableton Live with administrator rights (right-click on the Live's shortcut icon) and rescanning the plug-ins should fix this problem.
You should download Win64 version of the plug-in since it should match host's code version. For example, if you were using Win32 host, even on Vista 64, you should have used Win32 version of the plug-in as well.