32 bit curl is safer. It should be located in C:\Windows\System32 folder.
If you are on Windows 10, version 1803 or later, your OS ships with a copy of curl, already set up and ready to use.
If Windows 7, see this making-curl-work-on-windows-7
If you are on Windows 10, version 1803 or later, your OS ships with a copy of curl, already set up and ready to use.
If Windows 7, see this making-curl-work-on-windows-7