Based on the file naming convention you provided, this refers to a legacy version of the plugin (developed by PSoft ), which is designed to create a non-photorealistic sketch (NPR) effect within 3ds Max.
: After downloading, find the .dlt file that matches your specific 3ds Max version (e.g., Pencil+4_2015_ntr.dlt ). psoft pencil 4 for 3ds max 2015 to 2018 win top