Is a key available for this build of Windows 10 Enterprise?  Despite the warning of the build not being activated, is it even necessary to install a key? 

Gary

10532 is an insider build.  Ever since 10240 there are no "keys" per se.  Enterprise can only be activated by downloading from the volume license center and using that key to activate.  Enterprise is not eligible for the free upgrade.

Thank you.  I did find similar responses on further research.  Since I do not have access to a Enterprise license key, is there an easy way to downgrade this preview install to the Windows 10 pro general release?

  The Windows Insider program has changed since the official release of Windows 10. You can no longer install an Insider build and have it activate. You need to be running an activated version of Windows 10 before you join the program.

http://blogs.windows.com/bloggingwindows/2015/08/18/announcing-windows-10-insider-preview-build-10525/

 See particularly paragraphs 4 & 5.

How can I go to the official Windows 10 release from the Insider Preview?

This activation is very annoying.