ManicTime download includes Standard (free) and Professional edition.

It also includes a 15 day free trial to preview Professional edition. After the trial ends, you can revert back to a Standard (free) edition or purchase a licence key and use Professional edition.

ManicTime v2.1.2 (12/22/2011) What's new in this version
Recommended download ManicTime.exe (5 MB) * requires .Net framework 3.5 SP1 to run.
Other downloads Zip package (4.5 MB) Msi package (5.3 MB) USB Version (4.5 MB) How is USB version different? * these versions won't check for .Net framework 3.5 SP1 so make sure it is installed before you run ManicTime.

ManicTime Server v1.1.2 (1/5/2012) What's new in this version Learn more
Zip package (3 MB) * requires .Net framework 4 Client Profile to run.