This worked! Thank you so much.
I installed and ran KUAL-v2.7.35-g2d06358-20250103/Update_KUALBooklet_v2.7.35_uninstall.bin — i.e. the version corresponding to what I installed before.
I downloaded DevCerts-20250419-KeyStore.zip, unzipped it, installed and ran Update_mkk-20250419-k4-ALL_keystore-install.bin
I downloaded KUAL-v2.7.37-gfcb45b5-20250419.tar.xz, unpacked it and copied KUAL-KDK-1.0.azw2 into the Kindle /documents folder...
I restarted, and now when I click on the KUAL book, it works!
Thank you for your help.
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