You can easily upgrade Windows 10 32 bit to 64 bit as long as your computer meets the upgrade requirements and you have a copy of your important data.
How to Install Windows 10 (with Pictures) - wikiHow
Upgrade Windows 10 from 32-Bit to 64-Bit without Data Loss
Swap Microsoft Office 365 from 64-bit to 32-bit or Vice Versa
Recovery, Repair & Re-install disc compatible with MS Win 10 32/64 bit
Free Download Windows 10 64 Bit/32 Bit Full Version
How to Reinstall Windows without Losing Data: Complete Guide
How to Upgrade Windows 10 32Bit to 64Bit without Losing Data for FREE
How to Upgrade Windows 10 32-bit to 64-bit
Upgrade Windows 10 32 Bit to 64 Bit without Losing Data