I’m no longer able to print my Libre documents without converting them to PDF
This question is so unclear that probably no-one will answer it and people will just loose their time to read, like me.
If you need help, you should explain the problem in details, exactly what you do and what you want.
@Timur, please be more considerate of visitors and their questions. They are valuable. Yes, all your documents can be used in later versions of LIbreOffice. If you are having a problem with printing, please describe the steps and results you are taking to print.
@razon_22, Timur does have a valid point. Most just won’t bother to write a question that makes sense.
The currently used file formats are designed for a long life. Making things more future-proof and improving interoperability is a main concern of the ODF specifications and of open-source projects using them for their standard formats of files. A specific version, however, may contain a bug that can cause an error when saving under specific circumstances. If you suspect the version you use to be buggy in that way you should describe your problem in more detail. (Version of LibO; OS and its version; specific circumstances).
Very strange errors are sometimes due to a user profile corruption. Read this if you think that might be your problem.