I have a fairly complex spreadsheet that won't open since I installed 4.2.4.2...what can I do to open it

I have a fairly complex spreadsheet that won’t open since I installed 4.2.4.2…what can I do to open it

May I ask you to please have a look at: What information should I include in a question in addition to OS and LibreOffice version? - #4 by ROSt53