I'm not sure when it happened, but Solutions in Hand has upgraded Mini Calc (and their Mini Office suite) to version 7.0.
Main difference appears to be improved high-resolution support; more high-res icons and whatnot.
A big drawback for anyone considering investing in this software is that Solutions in Hand appears to have removed any online payment options; I guess that they expect you to pay via a check and snail mail.
(there must be some reason for this, but it seems like a very extreme move...)