I am currently using 13.2 on an older system using vga connection. Will the 42.1 run on the system as it is or do I need a different screen connection for the 42.1? Does plasma run on a vga connection? Thank you in advance.

In general, it should be ok. It’s generally more useful to provide the graphics card and driver details eg hwinfo

/usr/sbin/hwinfo --gfxcard

Use this to get the current (and available) display modes…