This thread came right on time for me!
I did get the error message @Wheelzz got, but I ended up following the solution @joekamprad gave. That said, Joe’s gave me the “invalid or corrupted” message again, so out of slight frustration, I just went ahead with the last three commands (starting with sudo pacman -Scc).
That ended up fixing my problem. Maybe I just needed a cache cleaning and key refresh. Regardless, this helped fix my problem!