yes I can confirm it isn’t malicious in any form. It will display an offer screen for an optional third party during the setup. You can also skip the download / ignore the error without any effect on the PDFCreator functionality.
I have run into a similar problem with installing the free version of PDF Creator V 3. The company uses ESET Endpoint Antivirus, and it stops the download process dead in it’s tracks because of the op.exe file is flagged as a possible unwanted file. Our IT manager will not change the permissions level on ESET to permit that file through, so I will be staying at version 2 for the foreseeable future. .