Click on this link to take you to the e-support page of Sony laptops.
Here, under the UPGRADE section find "Check Your Model".
Then choose the category of your PC. Is it Notebook, Desktop, or Digital Living/Home? (Wait for some time for the series and model to load).
If you know the series number then choose that, if not go for the model number.
Then choose the model number and then click on Continue.
Now, you would know whether you would be able to upgrade your computer to Windows 10 OS.