Both classic Notepad and classic WordPad can be downloaded and installed from third-party sites.

However, to thoroughly neuter the enshittified versions and ensure the classic versions are used in all workflows can take a bit more than what the installers recommend. Primarily, I would recommend adding the *.bak extension to the enshittified versions then make (IIRC) junction links from the classic ones to where the enshittified ones are sitting. This ensures that if anything reaches for the enshittified ones, the junction links are there to redirect the action to the classic versions.