Because Apple's ecosystem is closed, you cannot simply click a link to install an IPA. You must use a "sideloading" tool.
: This is a community-managed repository that aims to preserve older versions of Minecraft for iOS. You can search the Minecraft iOS Archive for specific build numbers related to 1.17. minecraft 117 ipa download link
The safest and most reliable way to get Minecraft 1.17 on your iPhone or iPad is through the Apple App Store. Because Apple's ecosystem is closed, you cannot simply