See the official post from its original developer here. Unchecky will have a standalone version as well as being integrated into Reason Software's Reason Core Security.
A recent entry on the author's blog confirms that the software has been acquired by Reason Software.
According to the blog entry, nothing will change for existing Unchecky users. Unchecky will be integrated into Reason Software's Reason Core Security application that is available as a free and paid version.
The core difference between both versions is that the paid version offers real-time protection and automatic scans while the free version does not.
Unchecky has already been integrated into the program so that users of it benefit from its functionality.
For those who are unfamiliar with Unchecky: It is a small utility that warns you when something is going to install a PUP (Potentially Unwanted Program) on your machine, and automatically unchecks those additional "options" for you.
However, there are two things to take note of: 1) Unchecky was still in BETA before this (status unknown after); and 2) Unchecky will not work if the installer does not have checkboxes in its standard installation mode - you will have to choose Custom Installation for it to work.