Laminar broke the window heating response and we are still waiting for a fix. In the meantime you can try a workaround script: https://github.com/pilsnerish/FlyWithLua-Scripts/blob/main/CL650_window_heat.lua
It might help the developer to hear what information you feel was missing from the documentation/assistance already provided with the aircraft files and in the sim (via the hint images and virtual first officer)? Thanks.
Like you said, a timing issue, those datarefs aren’t created until after the script loads.
https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests
Seems nothing to do with Challenger and everything to do with Resources/default scenery/airport scenery/Dynamic_Vehicles/Master Bank.bank being broken.
You can contact their support and ask if buying the 12 version will let you have access to the 11 version. But let’s be real, the 11 version, like the sim itself, is end-of-life and will never be worked on again.