The acquired library file must be placed in the LIBRARY folder within the Proteus installation directory (e.g., C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\LIBRARY ).
Once you have downloaded the .LIB and .IDX files, follow these steps to add them to your software: ir2153 SIMULATION MODEL FOR MULTISIM - NI Community Ir2153 Proteus Library Download
Some packages also include a .HEX (firmware) or a .MSM (model file), but for the IR2153, a SPICE model is usually embedded in the .LIB . The acquired library file must be placed in