Can't find CD4050 library in Proteus 8?

I am using this schematic as a frequency meter. I tried to search proteus libraries for this CMOS ‘CD4050 , [IC3 in this schematic]‘ but all I’ve found is 4050 CMOS non-inverting buffer with one input and one ouput, I need this specific element with all the other pins of it, not the 4050 CMOS that proteus is showing, because the whole design of circuit counts on this element ‘CD4050′. Any idea how to add this element to proteus ? Where can I find the library of this element. Please advise me ASAP. Thank you all.