1. Signup to NextDNS and follow the above video.
The URLS:
ocsp.apple.com
ocsp2.apple.com
PPQ.apple.com
valid.apple.com
crl.apple.com
certs.apple.com
appattest.apple.com
vpp.itunes.apple.com
You can also use any DNS of your choice.
Important Note: When installing or opening applications for the first time, it is important to disable either complete DNS or just disable the URL “ppq.apple.com.” This is necessary for the successful installation of applications.