Find a reliable source like the STM32 Library for Proteus on GitHub or engineering forums.

: If the software was open during the transfer, restart it to allow the database to re-index the new components.

For , check: C:\Users\[YourUserName]\AppData\Local\Proteus 8 Professional\

C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\DATA\LIBRARY : If you cannot find the