I have exactly the same problem. Reinstalling does nothing for me
This is what I get whenever I try to use Sellacious Related Products or Sellacious Latest Products,
Fatal error: Class 'ModSellaciousLatestProducts' not found in /home2/sniip3r/public_html/templates/squick/html/mod_sellacious_latestproducts/grid.php on line 71
I have checked the location, the files are there, not missing.