I've got a few days to decide whether to upgrade to Win 10 for free (from Win 7).
 
Does anyone know if the above version of Sonar will work with Win 10 - also using a A800 keyboard and lots of different (mostly free but including paid for Sampletank) plugins with it so would be good to get views on likelihood of those working with Win 10 too
 
Cheers

All of your stuff should work but I think its time to upgrade to Sonar Platinum. Is the A800 an A800Pro? The A800Pro has Windows 10 drivers.

Some of the CAL routines only run in XP compatibility mode in Windows 7, and there's no XP compatibility mode in Windows 10. You can only go as far back as Windows 7.

At the very least, you might want to update to 8.5.3 (last patch for 8.5).

Resonant Serpent
Some of the CAL routines only run in XP compatibility mode in Windows 7, and there's no XP compatibility mode in Windows 10. You can only go as far back as Windows 7.

Compatibility settings are still available in Windows 10, which will allow you to use XP compliant programs under Win 10. There is no XP mode, which is an altogether different animal available only in Windows 7 Pro. The Win 7 Xp mode is a licensed copy of XP running in a virtual machine on Windows 7. You can still run XP in a virtual machine under Win 10 if you need to, but you have to set it up manually. In any event, if you were running Sonar in an XP virtual machine, the whole program would be running on XP, not Win 10 in compatibility mode, which is just a socket for older programs that have problems running in Win 10 without aqdjustments. 
 
http://www.howtogeek.com/228689/how-to-make-old-programs-work-on-windows-10/
 

sonar 8.5.3 64 bit running fine here along side sonar platinum in windows 10. hope this helps

dude24man
sonar 8.5.3 64 bit running fine here along side sonar platinum in windows 10. hope this helps

That is what I have heard too. 

Thanks all - that sounds promising - I forgot to say it is the LE version that I got bundled with the APro 800 keyboard. To be honest the LE version does most of what I want to do as I am a hobbyist that dabbles rather than a producer.  

That shouldn't matter. 8.5 runs fine on Windows 10, no compatibility mode setting required. If installing on a new computer, run the install as Administrator to avoid possible problems with some older plugins.
 

I'll take it for a spin for you tomorrow. I have 10 on a recently upgraded partition on my laptop that had 8.5 loaded on it. The laptop is at my shop so it'll have to wait till then.