The library for Proteus can be downloaded from community repositories like NirisonFabrice's GitHub . Once you have obtained the library files (typically with .LIB and .IDX extensions), you must manually add them to your Proteus installation directory for the component to appear in the "Pick Devices" window. Downloading the SG3525 Library
If you cannot get the SG3525 library to work after several attempts, you have alternatives: download sg3525 library for proteus
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: SnapMagic (formerly SnapEDA) offers symbols and footprints that can be imported into Proteus, though these are primarily for PCB layout rather than active simulation. 3. How to Install the Library Optimized for search term "download sg3525 library for