I have solved my issue, but it requires an intermediary (FFmpeg). Someone may find the following useful for future reference...
1. Download a command line copy of FFmpeg (Windows 64 bit version).
2. Move the files into your Windows Programs directory (C:\Program Files).
3. Add FFmpeg to your system (or user) PATH. Example: C:\Program Files\ffmpeg\bin
For testing, I created a ►very simple◄ animation in Blender 3D (a rolling tire
and rim). I rendered the animation to a sequence of transparent PNG's
using the following settings in Blender:
✦ Insure no background has been set (e.g. Compositing nodes, or in the World → World panel).
✦ Output Panel → Browse to correct directory, and set the filename.
✦ Output Panel → Format: PNG | RGBA
✦ Shading Panel → Alpha: Transparent
✦ Dimensions Panel → verify dimension, start/end frames, etc.
✦ Render Panel → click the Animation button.
✦ Blender generates sequential files in the format filenameNNNN.png where NNNN begins with 0001.
Then convert the PNG's to Quicktime...
✦ Open an MSDOS/cmd window
✦ Change directory to the sequential files
✦ Enter the following command:
<code>ffmpeg -start_number 0001 -i filename%04d.png -acodec copy -vcodec copy -f mov myFinal.mov</code>
The video (myFinal.mov) can now be imported into Camtasia.