Download any VPN (I would recommend TunnelBear, it's free) from the Play Store switch to any Nordic country or Canada, create a new Gmail account and Clash Mini should appear in the Play Store for you to download :)
(this is for Android, Iphone is basically the same (i think, feel free to correct)
Step 1 : Get your mom's credit card
Step 3 : Buy it
Step 4 : Download cm
Step 5 : Enjoy
* Only Happens in high end devices
Try downloading this one, it's free. https://play.google.com/store/apps/details?id=com.smartpack.kernelmanager.release
Open the app and grant it root access, then navigate to the gpu section, there you will see the gpu governor, tap on it and change it to simple_ondemand from default. If the problem still persists then try changing the cpu governor to conservative.
These changes will not eliminate the overheating issue, it will still heat up a bit but it will be less.
Change your location to Finland and make new Google acc then change to the new Google acc on play store ,all this while being connected to vpn and he should be able to download it (I recommend vpn TunnelBear )