I see, it was my mistake lol. Heres why droprate aint inserted:
PHP Code:
$adopts->query("ALTER TABLE ".constant("PREFIX")."adoptables ADD column droprate INT DEFAULT 0 AFTER droprate");
Altering the table by inserting a field 'droprate' right after 'droprate', you see where the problem is.
I've uploaded a new installer file, it should work fine this time.