Robert van der Hulst passed away in 2010? (Correction: Please verify current status – as of my last knowledge, he was alive but retired). Regardless, his works are copyrighted until 70 years after his death. Unauthorized reproduction and distribution of PDFs violates the Auteurswet (Dutch Copyright Act). You are stealing from the artist's estate and legal publishers.
Since the series is largely out of print, your best bet is the second-hand market. Trusted platforms include: Rooie Oortjes Strips Pdf Free-
Websites that host pirated content are rarely secure. They are often riddled with intrusive pop-up ads, and in many cases, the "Download" button for the comic book file is actually a trap designed to install malware, ransomware, or adware on your device. Searching for "free PDFs" is one of the most common ways casual internet users compromise their cybersecurity. Robert van der Hulst passed away in 2010