Hi there, nice one!
I downloaded the install hack as I have not used before and therefore avoided the update one.
I'm a total newbie and don't know what any of the code does but managed to solve a typo.
Code:
print_input_row($vbphrase['how_many_Days_till_expire'],forum[daysexpired]', $forum['daysexpired']);
after _expire'], I had to put a space and ' to get it to work.