It is not a native "feature" of iOS, but rather a for side-loading or enterprise installations. Why you must use Safari
Are you trying to install a specific or an enterprise work app ? I can give you more specific steps if I know what you're downloading. download ios version-please open via safari
Here’s a review-style response for the instruction : It is not a native "feature" of iOS,
Annoying but necessary – Apple’s ecosystem forces this behavior for certain downloads. Following the “open via Safari” instruction works 99% of the time. ⭐⭐⭐⭐ (4/5 – loses one star for the extra step, but it’s consistent when followed.) Here’s a review-style response for the instruction :
While you can ignore the prompt, it's not recommended. If you ignore the prompt, you may not be able to access certain webpages or resources that require the latest version of iOS. Additionally, using an outdated version of iOS can leave your device vulnerable to security risks and bugs.