She explained it very well.
The online Turbo Tax is completely different than the Desktop CD/Download program. And by the way, it looks like your Mac is too old to install the Desktop program anyway. Unless you have another computer or can upgrade yours.
Mac System Requirements <a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1899173-minimum-system-requirements-for-turbotax-mac-software">htt...>
