the other 'p' is publisher? they've pulled the plug on that one too. will literally get yanked from 365 subscribers in october 2026.
if you want to ensure you have this application (i have a number of clients that rely on it) long-term, you need to buy a perpetual license for an office edition that includes it.
you're talking the 'RED' series inspiron minitower?
iirc there's only one 3.5in bay adjacent to the slimline optical bay, and two 2.5in bays in a cage at the bottom front.
bays use drive rails which may or may not be present if the bay was unpopulated when originally shipped.
the pc uses 12vo power supply, so the drives are powered off the motherboard. those cables may also not be present if they weren't needed for the original configuration.
slimline optical bays can often be filled with a caddy designed fit in the form factor, connecting to the optical power and sata, and hold a 2.5in ssd drive.
you will have to get ''creative'' to securely mount more than one 3.5in hdd inside.