I've had this app/addon for a while and have no idea why people are claiming this is a virus. (feel free to reply to me with proof that it is though)
The only reason I can think of why people say it's a virus is that you cannot uninstall it. This is false from my experience. From what I know, sometimes the App will fail to install an update or something. It will come up with a few pop-ups that have "Bug report" (or something i kinda. forgot!!) but it's very easy to uninstall and reinstall to fix it.
The app will still be running in the background whenever you close the pop-ups, you can just go to task manager and close those to uninstall the app or delete the folder completely. C:\Program Files (x86)\Samperson
I don't know much about Itch.Io but I'm sure if this was a virus it would have been removed by now. If you really feel unsafe with this app, I recommend Norton Anti Virus. It'll do a deep search to find whatever stupid virus or trojan is lurking on your pc.