Install wired to wireless

Seven zones are marked closed except the last zone is marked open, but all windows/doors are closed

In your image I don’t see a resistor on zone 7. Is there one that isn’t visible in the image?
However regardless the Open zone in your system programming is zone 8. If that zone is unused it would just need deleted as it will report open with no wires attached.

Settings > Advanced Settings > Installer Code > Installation > Devices > Security Sensors > Delete Sensor.

How do I get the Hardwire Translator to “learn” the zones? I’ve tried:
Auto learn
Arming the system and opening and closing the hard wired windows and doors

The zones are automatically learned in when you pair the Hardwire translator. That is why there are 8 zones already in the device list. They are given the same default zone type. This is described on page 27 of the Hardwire PowerG Translator manual.

The pre-loaded zones are then be edited to match the zone type of that wired input. To do so, go to Settings > Advanced Settings > Installer Code > Installation > Devices > Security Sensors > Edit Sensor.

There you can edit the name and chime, etc. The Sensor Group controls how the panel reacts to that zone.

For entry doors, use Sensor Group 10 Entry Exit.

For windows, use Sensor Group 13 Perimeter.

For motion detectors, use Sensor Group 17 Interior Follower.

Here is a list of Sensor Group options and what they do for different sensors you might have.