What is the proper way to install an app with a cab file?

[New Daddy]

I'm running low on main memory but have plenty of memory on my storage card.
The problem with low main memory is that I am prohibited from installing new apps on to my storage card, because an installation program, by default, always tries to copy the cab file to the main memory first, even when the final destination is the storage card.
So I tried to copy the cab file to the storage card, run it from there, and select storage card as the destination.
All this seemed to work fine, except that now the name of the application (SK Tools in this particular incident) did not appear in the drop-down applications list, although the executable file could be found with file explorer and run from there.

Did I miss something? What is the proper way to install an app with a cab file from the storage card?