Plex Documentation → Your Media
→ Naming & Organizing TV Shows
→ Naming & Organizing Movies
You do not need to remove Plex Media Server from your system.
Rename/reorganize as @tom80H suggests. Note that “Season” should be in English, per Plex documentation.
Then Plex Dance the series. This will remove any bad matching information from the Plex database.
See the documentation linked above. You can add the TVDB/TMDB ID to the show folder name. This tells Plex exactly which show to match. You can also add the IMDB/TMDB ID to movie folder & file names if desired.
If you’ve many shows to rename, there are tools that can help automate the process.
Many people use Filebot. It is quite powerful and can rename an entire library in minutes.
Tiny Media Manager is also very useful. I’ve used the free version to rename several movies with the pattern ${title} (${year}) {imdb-${imdb}}. You can easily set a pattern for TV shows that matches Plex’s naming standards.
PowerRenamer in Microsoft Power Tools is helpful for simple renaming with pattern matches or regular expressions. It makes quick work of tasks such as adding a year to file names, removing undesirable text from multiple files, etc. Simple example: Rip a TV show with MakeMKV and all the episodes have _tXX at the end. You can remove it from all episodes in just a few seconds.
