If you are trying to from an old GoodReader installation or need help transferring PDFs to a new device, I can walk you through the official sync methods.
: Modified apps can contain malware, keyloggers, or spyware that can steal your Apple ID, passwords, or personal data. If you are trying to from an old
: This indicates version 5.11.7.7 of the app. If you are trying to from an old
: Likely stands for "Unknown," possibly referring to the cracker or the source. If you are trying to from an old
: This usually signifies compatibility starting from iOS 11.0 .
: Suggests this version may have certain tracking or user-identifying features stripped out.