For less than $30, you can use a standalone converter that doesn't require a product key:
Even if you find a product key, the software is likely to be unstable on a modern PC. Frustration and wasted hours are almost guaranteed.
If you run a blog or forum: Do NOT post lists of Honestech product keys. Even though the company is defunct, the software may still contain licensed codecs from third parties (e.g., MainConcept, LAME). Distributing keys could expose you to DMCA takedowns from the current IP holders.
The "Deluxe" version typically included additional effects, transitions, DVD menu templates, and support for burning widescreen DVDs. At its peak, it was a $59.95 value.