The download file is the same for Free, Standard and Professional Editions. When you install the product, the Professional Edition is installed, and will work for 30 days. After 30 days, it will automatically revert to Free Edition, unless the Standard or Professional Edition license is purchased.
Which edition should I choose?
The latest version of Security Manager Plus is 5.5 (build 5511). If you are using an earlier version, you need to apply
to upgrade to the latest version. See
whats new in 5.5