LibreOffice can open .WPS (MS Works) files. But it does not associate itself with those files automatically; if you had that association previously, then you must have done that yourself (even if you did that unconsciously, e.g. answering somewhere “Open these files with LibreOffice -Always”). But then you upgraded, the old version got uninstalled, removing the old association; the other application on your system that claims to be able to open those files (Google Chrome?), or the one that you tried to use to open them (and also kept the “Always” checkbox?), is now associated with them.
You may open those files from LibreOffice itself: open the application; use “Open” button/menu; and select the files you need from the dialog.
Or you may look this Ask site for the many question about file associations (type
associate files windows in the Search box at the top, and press Enter), to learn how to manage file associations on your operating system.