If you purchase a legitimate theme or download a free one from a trusted source, follow these steps to install it:

If you inherited a forum or are suspicious about a theme you installed in the past, perform a security audit:

Many nulled files include unoptimized code or spyware that can significantly slow down your site and increase bounce rates. Lack of Updates:

People don't "null" scripts out of the goodness of their hearts. Most nulled themes are modified to include malicious code Data Theft: