link and instrunctions where where in the very first post.
http://www.howtogeek.com/228042/how-to-switch-from-32-bit-windows-10-to-64-bit-windows-10/
1st ) make sure CPU support's 64 bit
http://www.cpuid.com/softwares/cpu-z.html
2nd) since you have alredy updated see
Once you’re already using an activated version of Windows 10, download the Windows 10 media creation tool from Microsoft. If you’re using the 32-bit version of Windows 10 at the moment, you’ll have to download and run the 32-bit tool.
https://www.microsoft.com/en-us/software-download/windows10
Select “Create installation media for another PC” and use the tool to create a USB drive or burn a disc with Windows 10. As you click through the wizard, you’ll be asked whether you want to create 32-bit or 64-bit installation media. Select the 64-bit architecture.
you will have to pick the 64bit verion.
3rd) after you do this
Next, reboot your computer and boot from the installation media. Install Windows 10, selecting “Custom install” and overwriting your current version of Windows. When you’re asked to insert a product key, skip the process and continue. You’ll have to skip two of these prompts in total. After you reach the desktop, Windows 10 will automatically check in with Microsoft and activate itself. You’ll now be running the 64-bit edition of Windows on your PC.
all pretty stright forwaord but the old 32 has to go and the new 64bit has to come in if you want it legit, if you dont want it legit you will have to "buy" a separate copy of win 10 64 bit cause you cant have 2 of the same "keys" activated on the same machine. even if you do a parallel install.