All hotfixes and patches are posted on our download page at http://www.durkincomputing.com/Download.aspx All minor incremental version-numbers are always free upgrades because these releases include fixes, and also minor product enhancements. All major product increments include major product enhancements and so are chargable upgrades.  

What is a build number:
The process of compiling and packaging an application is sometimes referred to as "building". A version such as 5.2 (Build 111) will be compiled many times before it is released. In this case it's been built and tested 111 times. Each of these "builds" are numbered so developers can keep track of changes and problems. Think of it as versions of the released version. 

Every release will have a unique build number displayed on the far right side of the product entry. In this example we can see that Impact Business Suite has a build number of 5.2 (Build 111)

5       - The major product number
2       - The minor product number
111    - Product modification number 
004     - The incremental build number

See also