Of course you can use SalesMate + without Internet Connection. But it will be really good if you have internet connectivity once in a month to check for any software updates so that you can download and install the Updates. If you are using Monthly subscription plan , then connecting to the internet will be a good idea to renew your subscription plan automatically.. Else you need to contact the vendor through E Mail to renew the license manually ..
In any case Internet connectivity is not a mandatory thing.. If connectivity is there ... It will ease everybody's life ..
Thanks
SalesMate + Admin