Original text on this page previous to its migration to StructuredDiscussions:
There's a public google drive with a large assortment of demos and patches for Lego games on multiple platforms. I found a backup of the Lego Movie 1 PC demo there; it might be of further use. https://drive.google.com/drive/folders/1piMEGMsS-1PGQcx-9o5aulkdcDc8cXJn