I haven’t seen it posted on here so apologies if this method is already known, just wanted to share what worked for me.
- Turn off location services. (settings, search, location)
- Turn off cellular data.
- Connect to wifi.
- Open app store.
- Navigate to app you want to download or update.
- Turn on VPN.
- Click on Get/ Update.
This may take a few tries but will work eventually, depending on your wifi’s speed.
- Once the download starts (circle with stop button appears), switch back to cellular data and turn off VPN, turn location back on.
Hope this helps 
It didn’t work for me and it keep saying , it’s not available in my country
Use a free vpn server like this and apply it in the iphone settings, from there you can install Psiphon (free vpn app) from the app store which I highly recommend.
Hello, so you just have to keep hitting the download button with vpn turned on (doesn’t matter if it’s wifi or cellular now since 2022) until it asks for your apple id password or touch id/ face id. It can take a couple tries but it does happen. Once the download starts, pause it from the home screen and turn off vpn, then continue the download like normal. Keep the location services for the app store turned off the whole time.
Sorry I haven’t updated this post since 
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