You should be cautious with sites offering "ChemWindow 6.0 free download," as this was originally a commercial product Legitimacy:
: Because it is proprietary software, most sites offering "free downloads" of the full ChemWindow 6.0 version are often unofficial third-party sites that may bundle malware or provide unauthorized cracked versions. Recommended Alternatives chemwindow 6.0 free download
Sites like Software Informer and SoftDeluxe maintain archives for legacy versions like 5.1 and 6.0, often used for compatibility with older Windows platforms (XP, 7, 8). You should be cautious with sites offering "ChemWindow 6