Here is a copy of an email I sent to Bob Wilcox at Jetcat USA, along with his reply. I think it is somewhat relevant to this thread.
Galen

" I have a Jetcat P-120 with airspeed sensor that I purchased from Nicolas of Spiderjets. I noticed that you say not to use mph in setting it up. Would this apply to my ECU also since it was delivered from Spiderjets? If so is there a software fix being planned? Also the data retrieval disk is in DOS with a note that a Windows 98 upgrade would be available to down load soon. I have searched both Yours and Jetcat's European site and cannot find it. If it exists could you tell me where it is located or where I can purchase the Windows 98 version?
Thank you,"

Hi Galen:

We will have the new Windows program on our Web site shortly. You will be able to download it from there.

The MPH bug is in all ECU's up to and including 2.01U. This is the same no matter where you bought it. There will be a upgrade available in the next couple of weeks and it will be announced on our Web site.

Bob Wilcox, JetCat USA