If you cannot find a free PDF online, the most practical solution is to buy the Indonesian printed book and scan it, or look for these publishers:
: Memuat identitas kitab lengkap beserta akses baca/unduh secara berkala. TerjemahKitab.com
Kitab Al Asybah Wan Nadhoir, also known as "The Book of Similarities and Counterparts," is a comprehensive treatise on Islamic jurisprudence, written by Ibn Al-Qayyim (1292-1350 CE). The book is a collection of discussions on various aspects of Islamic law, theology, and spirituality, where the author explores similarities and differences between various concepts, principles, and rules.
When you find a PDF, check the table of contents. Some Indonesian translations only cover the first part (The 5 Universal Maxims) because that is what is taught in most universities (S1/S2 levels). The full translation is rare and highly academic.