Dimension unable to open my .dn files

I'm using my Mac studio M2 max with 32 GB memory and Dimension is V4.1.1.  I couldn't open my dn files I created yesterday so I chat with one of the adobe agent, he suggusted update my OS. After all the updates and restart my computer I coudn't open any of the dn files I created for the past years. This is very frustrating. Please help to resolve this problem asap. Thank you.