Just sayin....for those of you sitting on the fence about whether or not to upgrade your DAW. 
 
And for the record, Sonar runs absolutely awesomely on it, definitely the best version of Windows I've used so far and I've had no problem whatsoever with either Sonar or any of my other audio software or devices (other's mileage may vary)...

+1 sharke

Leaving Windows as SOON as OSX version is released. Windows 7 has never failed me...but I HATE Microsoft. I know the arguments on both sides, but I have made my choice...everyone else will make theirs as well

Sonar does seem to be running well on 10 for me too, I just upgraded last week.
 
I recommend to anyone who has to uninstall a program before upgrading to 10 (the wizard will tell you which programs they are) to quit the upgrade process and uninstall them normally/manually first, then try the upgrade again. I've had a little weirdness surrounding those "uninstalled" programs post upgrade and suspect that would have helped.
 
I don't know about anybody else, but I had a lot of problems with iLok/PACE after the upgrade. Computer wouldn't see the iLok, I couldn't run the license manager (it said the installation had "missing components"), and therefore couldn't use anything with keys on the iLok. I tried doing a fresh install of the license manager but couldn't actually fully uninstall the software (I never tried uninstalling it on 7, so maybe that would have been an issue before too). Anyway, the solution for me was to go into startup items and set PACE Security to "delayed" start. Haven't had a single (functional) issue with it since then.
 
Hope that's helpful info for anybody doing a last-minute upgrade today!

I had to set PACE iLok to delayed start on both of my computers also.

violacompost
I don't know about anybody else, but I had a lot of problems with iLok/PACE after the upgrade. Computer wouldn't see the iLok, I couldn't run the license manager (it said the installation had "missing components"), and therefore couldn't use anything with keys on the iLok. I tried doing a fresh install of the license manager but couldn't actually fully uninstall the software (I never tried uninstalling it on 7, so maybe that would have been an issue before too). Anyway, the solution for me was to go into startup items and set PACE Security to "delayed" start. Haven't had a single (functional) issue with it since then.
 

I actually just ran into this issue last night.  I had previously had iLok/PACE installed on my Windows 8 machine and then did the free upgrade to Windows 10 and everything worked fine.  However, yesterday I purchased the lifetime updates for Sonar and decided to wipe my computer clean and do a fresh install of Windows 10.  After the install, iLok wouldn't install with the same error.  I did some searching and apparently it has something to do with missing Visual C++ Redistributable packages.  Some people reported success by going to MS's website and installing all of those packages but I haven't tried that yet. . . I'm not totally comfortable with doing that.  I'm thinking of writing an email to iLok to ask them if a fix is in the works on their side, since all other programs have installed fine.  Until then I'll have to live without AIR Hybrid 3, AIR Xpand!2 and Softtube Time & Tone Bundle :(

Crap. I let this slide too long because I was waiting to figure out how to get a FULL ISO for a clean installation (as opposed to the upgrade method which I don't trust AND I want to install on a partition first to test it all out).
 
So even though I have other stuff on the go I'm poking around to see if I can just download the bugger and install later at my leisure.
 
After about 30 seconds of searching it seems this might be possible and I'm going to provide the links here... a) to maybe help others scrambling like I am (and don't want that foolish upgrade option) and b) to see if anyone who's been through the process can offer some extra intel on WTF I'm doing.
 
Here's the MS page with download links including their ISO/Install Media Creation tool. Not sure if this is the full version for clean install or if it's an "upgrade wizard" thingie that hooks into the system being dl'd to...
 
https://www.microsoft.com/en-ca/software-download/windows10
 
Here's a "HowToGeek" article on doing a clean install using what seems to be a proper ISO with links to the downloads and directions. I CANNOT VERIFY THAT THIS IS A GOOD ARTICLE OR LINK because I haven't fully read or digested it yet but I have used this procedure in the past for Win7...
 
http://www.howtogeek.com/224342/how-to-clean-install-windows-10/
 
 
What I'm hoping will happen is I can just download a single ISO (or two ISO's) for my two current Windows systems and simply apply my serial number/reg codes at my leisure (on partitions at first and then maybe do a full wipe and install if I like it). My DAW is Windows7 64 Professional and my laptop (which I use for intertube stuff and testing things out) is Win7 64 Home.
 
Gonna poke at this and see what's up and hopefully end up with a a DVD copy to use for later installation when I have time or cram the ISO's on one of my USB thumb drives.
 
 
Thanks for the reminder, sharke. This is what I get for procrastinating (but I have been busy and the "clean ISO" thing didn't seem to be clear or even possible when I first researched this all last year).
 
 
Cheers.

Beepster, you may also want to consider first upgrading to Windows 10.  Once you are upgraded, Windows 10 should have an option to "reset" your computer which will basically delete everything and do a clean install of Windows 10.  I just did it last night and it didn't require a CD or ISO or anything.  It was quite easy and then I didn't have to worry about serial #'s or anything like that.

rlared
Beepster, you may also want to consider first upgrading to Windows 10.  Once you are upgraded, Windows 10 should have an option to "reset" your computer which will basically delete everything and do a clean install of Windows 10.  I just did it last night and it didn't require a CD or ISO or anything.  It was quite easy and then I didn't have to worry about serial #'s or anything like that.

Indeed but I really do want to retain my Win7 installations for the moment for multiple reasons.
 
One thing I did not consider though, and could totally destroy my nefarious scheme, is whether these "free" upgrades need to be registered/activated before midnight tonight.
 
Like if I download the ISO(s) today but don't install/register them until a month from now maybe they won't work because the offer expired.
 
Oof. I'm going to try to download them anyway and hope for the best but I may be out of luck.
 
I'm also quite certain MS servers are going to be SLAMMED today.
 
Whoops. Should have gotten on this much much sooner.
 
/derp

The installation files will be available indefinitely but, you need to activate your installation by 11:29 PM July 29 UTC 10.
If you have waited this long, you are going to need a lot of luck, as the update servers are apparently getting pounded if my experience is any indication. One option is to install Windows 10 then revert back to Windows 7 or 8 after you activate your installation. The digital entitlement should stick to the machine so that you can activate Win 10 if you re-install it later. 

http://forum.cakewalk.com/FindPost/3455364
 
http://www.theinquirer.net/inquirer/news/2466327/windows-10-becomes-a-fully-fledged-paid-product-tomorrow-as-free-offer-expires

http://www.zdnet.com/article/the-procrastinators-guide-to-free-windows-10-upgrades/

http://www.zdnet.com/article/how-to-lock-in-your-free-windows-10-upgrade-and-keep-using-your-old-windows-version/