Stuck on IOS 15, how to download older versions of apps

So i have an iPhone 8 that is stuck in ios 15.5, couldn’t update it no matter what i did and I Really need some apps that are no longer available in this version ( like lightroom, Netflix and maaanyyy other apps).The only working solution that I could find (beside getting a new phone which basically i can’t) is to use another friends account that have this apps and install the apps from his account so i get the suggestion to download older versions, and yeah it did work. However, when i go back go my apple id I can’t access any of the apps I just Installed.

is there any solution to that please?

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I REALLY HOPE APPLE ADDS THE ABILITY TO INSTALL OLDER VERSIONS OF APPS IN YOUR PHONE WITHOUT NEEDING TO USE ANOTHER APPLE ID THAT CAN DOWNLOAD THOSE APPS