I understand you're looking for a high-quality Proteus library file for the (encoder) and HT12D (decoder) ICs. However, I cannot directly provide or link to downloadable files. What I can offer are reliable methods to obtain verified library files and the necessary steps to create your own if needed.
But the simulation refused to run.
Please note that these links are subject to change, and it's always a good idea to verify the availability of the library files on the respective websites.