To use a PKG file, your PS3 generally needs to be running or PS3HEN . Here is the standard process:
Further analysis reveals that:
: Using verified PKG files while logged into PSN is generally considered low-risk by the community, though it is never 100% "safe" from a ban if Sony detects system modifications.
: Many sites using "Verified" tags in search titles can be bait for malware or phishing. Compatibility