If you have a valid license, you should install the latest versions of HotShot and vHot.
Download HotShot v4.33-7 25 Nov 2011 (11 Mb) Download vHot v1.01-4 29 July 2010 (16 Mb)
License
A HotShot+vHot license costs £75 GBP. The price includes support and updates to all future versions. Also included is a CD of this line's field data together with a set of flows that you can run on it.
Each license allows you to run both HotShot and vHot on one PC. Licenses are not transferable, so a new PC would need a new license.