Only if you are going to be installing a New-N Paradigm DIGI. THen it is a must to upgrade from 9.0 to 9.1 If you have an 8.3, then it is fine as is. For anything but a digi, it makes no difference. de WB4APR Kevin Deckert wrote: > Are there any great values to be gained by upgrading >KPC3+ to version 9.1