Starting with version 3 there are separate kits for 32-bit and 64-bits systems, download from your favourite site and install. Version 3 kits will not affect or interfere with Version 1.x or 2.x installations.
Preview kits are very early development kits straight from the developer's computer. The test team have been breaking the software, the developer has been fixing as fast as possible. These are not beta kits, not even alpha, just something to show you what's happening here at Casa Del Software.
Kits are valid for 90 days from the date of compilation.