You’re suffering from a truly impressive case of verbal diarrhea, combined with a propensity for doubling down on the incompetent utterances sprinkled through it (@Gary pointed out several but I wasn’t sufficiently interested to be that thorough). Unless you’re a serious devotee of Donald Trump the most charitable explanation I can think of is severe cabin fever.
The issue right now is very, very simple: @Gary provided a detailed description (with accompanying explanations) of how he had succeeded in installing Perfect PDF nearly five hours before you claimed that no one had done so – and the only way it extended the description given through SoS was in specifying that the entire content of the downloaded .zip file should be extracted to a normal Windows directory and the setup.exe file should be executed from that directory (SoS’s instructions during the download DID include the fact that manual installation was required rather than simply clicking the ‘Install’ button but would have benefited from more detail about Windows’ foibles with regard to installing from multi-entry .zip files).
For all your babble since, my question to you is equally simple: have you ever actually tried carefully following @Gary’s directions or do you just want to continue to whine about how unresponsive the vendor is when people who clearly have no clue what they’re doing (even after other people have tried to help them) continue to whine along with you? I appreciate that there was apparently some problem with SoS’s ORIGINAL download mechanism (which I never tried) but that was rectified relatively early on.
As for the approachability of the application itself, have you by any chance tried pressing the F1 key? Strange as it may seem, that opens the application’s internal User Guide. I understand that newbies may be more accustomed to being led by the hand (e.g., by a Menu item) but the developers of Perfect PDF (v9 of which dates back to 2014) may have preferred to devote their screen real estate to other purposes (a choice which can certainly be debated with the understanding that standards in such areas have evolved over time and differed according to vendor philosophies – e.g., Microsoft vs. Apple).