I went update my charts and SD prompted me to allow an update of the software package. I clicked the appropriate permissions and just ended up with SD disappearing ! This happened twice and necessitated a system restore to get back to here. I have updated the charts, but retained my (apparently) earlier versuion of the software.

Why would this happen?

The computer is a Win7 netbook and this is the first time I've had difficulty with it when updating.

SD and a cheap Chinese satnav = Jobzagoodun.

If your shortcut to SkyDemon should ever go missing, it can always be fixed by simply uninstalling the software, then downloading and installing the most recent version from the link below. Your saved routes and logs will always remain untouched.

www.skydemon.aero/download.aspx

Thank you for your advise. You have saved my day!