If you are on Windows, you already have a good antivirus program built in, and that is Windows Defender. Other than that, be sure to install uBlock Origin extension in your preferred browser - it not only eliminates ads, but also annoying pop-ups, embeds, trackers, malware sites and other annoying things on the internet. When you want to download something, and you’re not sure if it’s safe, scan the download link with VirusTotal.

I prefer not to damage my magazines in any way, at least for now.

Agreed. I was using TiviMate on my NVIDIA Shield TV when I still had an active IPTV subscription, and nothing comes close in terms of usability and ease of use. I wish legit IPTV providers could offer us a way to watch TV from them with all those apps.