This article provides the complete solution. We will cover where to download the correct library (and how to spot fake ones), the step-by-step installation process, and advanced fixes for timing and I2C conflicts.
: C:\ProgramData\Labcenter Electronics\Proteus 8 Professional\Data\LIBRARY (Note: ProgramData is often a hidden folder).
: C:\Program Files (x86)\Labcenter Electronics\Proteus 7 Professional\LIBRARY .