Yes. If you upgraded an existing version of Windows, you can only upgrade to the same thing in Windows 10, i.e., Windows 7 Home 32 bit to Windows 10 Home 32 bit. If you want to change to 64 bit, you will need to make sure your hardware supports 64 bit first. Then you can retrieve your Windows 10 key using Nirsoft's Produkey and back up any information from the current installation you want to save. Use the Media Creation Tool to make a new Windows 10 installation media, then reinstall the 64 bit version using the key you retrieved.
http://www.nirsoft.net/utils/product_cd_key_viewer.html
https://www.microsoft.com/en-us/software-download/windows10/