All products are available as trial versions. You can freely download these trial versions and install them on your computer to test them for 60 days without any restrictions or any kind of commitment.
If you like the software and you wish to continue using it, you will need to purchase a license. After purchasing a license, you can use your license key to unlock the trial version. This license key is valid for all updates within the purchased main version – i.e. a license for version 16.0 is valid for all 16.* revisions.
You can find downloads for older versions by following this link.