Do not proceed if you see only one file. You need at least 2 pairs (HEX+IDX+LIB per IC).
The HT12E and HT12D are copyrighted by Holtek Semiconductor. The third-party Proteus libraries are reverse-engineered or recreated for educational purposes. Use them only for learning and personal simulation. Do not use them for commercial product design without proper licensing from Labcenter Electronics and Holtek. Ht12e And Ht12d Proteus Library File Download
If no data transfers, double-check: