Windows 10 May 2020 update is now available

No. You could have when it was first introduced back in 2015 but you're a little late now.

If you mean you have a VERSION of Windows 10 and want to update to the current version then yes, that would be free.

It has been released for those who had Win 10 Versions 1903 and 1909. If you have earlier versions you need to wait. They are coming.

If you have Versions 1903 or 1909 and want it NOW  you can download it here:

https://www.microsoft.com/en-us/software-download/windows10

What’s new in the Windows 10 May 2020 Update

https://blogs.windows.com/windowsexperience/2020/05/27/whats-new-in-the-windows-10-may-2020-update/

How to get the Windows 10 May 2020 Update

https://blogs.windows.com/windowsexperience/2020/05/27/how-to-get-the-windows-10-may-2020-update/

Known Issues:

Windows 10, version 2004 and Windows Server, version 2004

https://docs.microsoft.com/en-us/windows/release-information/status-windo

I am having this problem not able to update and not able to enable my Bluetooth , Bluetooth button is not displaying to enable