A: No. Older versions still enforce licensing, and downgrading can brick the iDRAC.
Before searching for a “free” key, check what you already have: Idrac 8 License Key Free
If the trial period ends and you still need Enterprise features, consider these options: Idrac 8 License Key Free
A library and command-line toolset that provides in-band and out-of-band IPMI software based on the v1.5/v2.0 specifications. It's a powerful solution for administrators comfortable with the command line. Idrac 8 License Key Free