During the peak of this trend, some repackaged versions of these icon packs on third-party download sites were found to contain adware or browser hijackers. This forced the legitimate creators to become more transparent, often releasing "portable" versions or providing MD5 checksums so users could verify the files hadn't been tampered with.
Are you looking to install this on specifically, or are you trying to use it on Windows 10/11 ? Windows 7 IconPack By 2013Windows8.1.exe - ANY.RUN windows 7 icon pack by 2013windows8.1