When running ISOBuilder with an OCP release older than 4.19 (e.g., 4.13.5), the validation error is surfaced by the appliance with the message:

"OCP release version must be at least 4.14"

 — which reflects the appliance’s own minimum requirement, not ISOBuilder's.

Expected Behavior:
ISOBuilder should enforce its own minimum version requirement (4.19.0) and fail early — before invoking the appliance — with a clear error such as:

"OCP release version must be at least 4.19.0"