Dear Sir. I have been using your product for last three years. I have renewed the product on 26 Mar 18 for three years. Bur after installing the renewal file it was asking for windows upgrade. I had to reinstall the window and I have upgraded to Windows 10. Now the product is not getting activated and it's showing "Too many user". Where as this has been used only on my PC always. Please help. Regards. Chandan Chattopadhyay.