I am not able to see the tablepress-shortcode-filter-get-parameter.php file
thanks for your post, and sorry for the trouble.
These features are now part of the TablePress premium versions, see e.g. https://tablepress.org/modules/row-filtering/ and https://tablepress.org/modules/datatables-auto-filter/
Both of these features modules support filtering from a URL parameter, which is the functionality that is described in those forums threads.
They are both part of TablePress Pro and TablePress Max, which are available at https://tablepress.org/pricing/
sure, no problem! Always happy to help!