ok...so i have been using express invoice for at lease 2 years now?? no issues really except it does take a lot of resources but i live with it. NOW after upgrading to El Capitan Version 3.99 locks up routinely and for no reason.
i looked at the update and i guess version 4.XXX is not an update but a new program you have to BUY again. $99!!!!!!!!! really???
seriously???? just make my 3.99 work with the current Mac OSX and i'll be happy