Hi Debanjan,
The serial to parallel component is there in the signal processing library, in the “Binary” folder in the “Tools” section. However, I think it has been added since Optisystem v. 9 and therefore you can’t use them in v.7 (but please check for it). As for what you asked about “electrical time delay” component, I can access it in version 13 in “passive library” and inside “electrical” folder. It has the same function as what you were looking for here, so there should not be any confusion.
Regards