Installing IPA files without jailbreak involves certain limitations due to Apple's security policies. However, several methods exist for users to install apps from outside the App Store, including using alternative app stores like AltStore, platforms like AppCake, or through enterprise/OTA installations. It's essential to note that while these methods do not require a jailbreak, they might still present security risks if not used cautiously and if the source of the IPA file is not trusted.