Well except for 2 minor glitches, this has been the easiest Windows upgrade ever. BTW, I was going from Windows 7 Home Premium to Windows 8 Pro. 1 glitch was for some reason yesterday, PayPal was down and you couldn't place an order. So I went out for a while and when I came back, it was working and so I ordered it. One thing I liked was that it forces you to run the Upgrade Advisor before purchasing and installing. I recommend you read that carefully especially if you have a lot of old applications or hardware. You can print out the output.
After you make the purchase ($39.95 plus tax if you choose to download it. Its a 2GB download and it took about 30 minutes on my computer with Time Warner cable modem service). Then you get the 3 BIG Options and there's no help on this (I don't remember the exact names, but I think I have the order right:
1) Install Now (self-explanatory, will upgrade your Windows 7 system to Windows 8)
2) Save to burn to external media
3) Save to Desktop
If you select the option to save to external media, i.e., DVD or Flashdrive, you will have to do a FULL install, which means you'll have to backup and re-install all your apps. There was no way I was going to do that.
If you want to order now, and do the upgrade later, take the option to save it to your desktop. That's what I was going to do, but then I said, "Ah... what the heck..." and clicked the icon on the desktop and installed it. The upgrade took at least an hour (I think... I went and had dinner and came back later and it had done the installation.)
Once I got past the problem with the UM-3G I mentioned earlier, everything is working. Sonar X2 seems to be fine.