Close any open Proteus ISIS instances. Relaunch the software. The library index rebuilds automatically.
Once installed, this library turns your PC into a genuine RF lab. You can bias the transconductance cell, tweak the carrier feedthrough null, and observe envelope distortion – without burning through a single chip or soldering a messy breadboard. Proteus Mc1496 Lib
By default on Windows: C:\ProgramData\Labcenter Electronics\Proteus 8 Professional\LIBRARY (Note: ProgramData is hidden; you might need to show hidden files.) Close any open Proteus ISIS instances