>In 2009 it was not just common, backward compability was Windoze's killer feature at that time.
You're massively confused and mistaken on what backwards compatibility actually is. Backwards compatibility means that a platform/OS from the present day can run software from the past, not that an OS from the distant past(2009) can somehow magically run software from 15 years in the future, which is what you're trying to do and is not a use case any mainstream OS has ever been designed for since nobody ahs a crystal ball to know how SW will be written in the future.
No it wasn't.
> Come on, this laptop definitely deserves to have a PDF reader.
Then use an operating system that is supported instead of expecting devs to do what you tell them to do.