There is no way to upgrade from a 32-bit operating system to 64-bit.
You can upgrade from Windows 7 32-bit to Windows 10 32-bit. But if you want Windows 10 64-bit on your laptop / PC, then you need to buy Windows 10 64-bit (it comes on a USB flash drive) and install it.
I you upgrade from win 7 x32 with free upgrade, your system will become x32 not x64
you can upgrade to x64 but will need to you BUY a windows 10 Home x64 thumb drive, and upgrade it from that point
There is no way to upgrade from a 32-bit operating system to 64-bit.
You can upgrade from Windows 7 32-bit to Windows 10 32-bit. But if you want Windows 10 64-bit on your laptop / PC, then you need to buy Windows 10 64-bit (it comes on a USB flash drive) and install it.