Hi, were you able to solve or understand more of the problem? The exact same thing happened to me, but, looking through installed software or active processes and performing several scans, I could not find anything. I tried to install it on purpose on an empty virtual machine, but, even there, I couldn't find anything. I only find an exe file in the Downloads folder, which is actually a link to the following address: https://www.7-zip.org/a/7z1900-x64.exe. I don't know what else to do.