Is there a Latin version of the Crater Hermetis by Ludovico Lazzarelli available online?
Yes, it is available on Archive.org. It is part of a volume printed in 1505 with this long title:
Contenta in hoc volumine. Pimander. Mercurij Trismegisti liber De sapiential et potestate dei. Asclepius. Eiusdem Mercurij liber De voluntate diuina. Item Crater Hermetis a Lazarelo Septempedano.
That translates to:
The contents of this volume. Pimander. Mercury Thrice-Majestic's Book of the Wisdom and Power of God. Asclepius. The same Mercury's book On the Free Will of God. Also Crater Hermetis by Lazarelo Septempedano.
(Translation mine, so iffy.)
I guess Hermes Trismegistus is "Mercury Thrice-Majestic" and the book is an anthology of works about or attributed to him?