The most popular upload is a massive ZIP file or video playlist titled "Little Bill - Complete Series (Nickelodeon/Nick Jr.) [VHS/DVD Rips]." This collection typically includes:
Yes, the full series (52 episodes across 4 seasons, plus extras) is available on the Internet Archive. However, it is not officially uploaded by Nickelodeon or the estate of Bill Cosby, but rather preserved by fans as a "lost media" / out-of-print release. little bill full series internet archive
Once you find the "Little Bill full series Internet Archive" file, you may encounter unusual formats: The most popular upload is a massive ZIP