Did you make sure that the path is correct to the folder where you downloaded the files ( look under File, Chart Info, Image File, and be something like C:\Program Files\Seaclear\
CHARTS)
Also, did you go under Mapcal (Seaclear Calibration Utility), Tools, Autoload List, Scan for new
charts) or Tools, Set Directories, and make sure the path to your
charts is there as well.
It has been a while since I loaded my free NOAA
charts, but they do work.
In Seaclear, I can go to File,
Charts, List all, and pick one.
I can also right click on the currently displayed chart, click
charts, and choose Best Chart or smaller scale.
I also imported some screen prints from
Garmin's blucharts, and they work, but I am not sure about the projection. I was able to calibrate them, following the Seaclear instructions.