Hi,
Version 6 doesn't work with Win7 or Win8 in the following cases.
- 1. Using Win8 with VS2012 ultimate.
- 2. Windows(7 or 8) was updated after 1/8/2013.
You can also install version 7.3 or higher and run with version 6 side by side.
In this case there are no restrictions.
Hope it helps.