Here is the download links for the pdf files. It contains 6th Thirumurai songs (4 parts in 4 pdf) from the book titled Thiruvarutpa penned by Vallalar. This book contains 6 divisions each named as "mudhal thirumurai", "iraandam thirumurai", "moondram thirumurai", "naanagam thirumurai", "eyindham thirumurai", "aaraam thirumurai". Here is the sixth division which considered as a most important guide to the Samarasa Suttha Sanmargam.
First part of 6th Thirumurai pdf
Second part of 6th Thirumurai pdf
Third part of 6th Thirumurai pdf
Fourth part of 6th Thirumurai pdf