A: Delete immediately. Use only the Internet Archive or ModDB sources. Legitimate HD pack .7z files are not detected as malware by Windows Defender.
Since you are using a non-Steam version, you likely have the original release. A: Delete immediately
If you must use a torrent, search for “Sleeping Dogs HD texture pack non-Steam” with a reputable tracker. Look for uploads by “Razor1911” or “RELOADED” (they originally cracked the pack). Always virus-scan. A: Delete immediately
Warning: Never run an installer named HD_Pack_Setup.exe that asks for admin rights without scanning via VirusTotal. A: Delete immediately