@Mortze:
Well you'll have a way to find out. Of course everything that follows only applies if you have a genuine copy of Windows 8.1.
1.- For playing safe, make a full image of your system, using Acronis True Image or similar.
2.- Go to
http://www.microsoft.com/en-us/software ... /windows10. Here I must say that when computers are concerned I always use English as language, because as a rule I'm unable to understand error messages in my native language. So you must find which address applies to your computer's language. Choose Windows 10 and then the 32 or 64 bits version and download the relative iso file.
3.- Burn the iso file on a DVD with the software you normally use for burning images (eg Nero). Once finished, remove the DVD and restart the computer.
4.- After restarting, insert the DVD you just created and from there, run
Setup.exe. In this way, the setup reads the serial number of the original Win8, and doesn't ask for it. If you start the computer through the DVD it will ask, and I've read that some people had problems although having genuine copies with good serial numbers.
5. Near the end of setup, when configuring settings, choose "customise" (or similar), and refuse all the suggestions of M$ (they only want to know about your life).
6.- Once installed Win10, play with DAZ and Photoshop and see if you like the results. If you don't you'll just need to recover the image you had created in number 1.
Cheers!