For anyone hitting 403 Forbidden on Beatport or Traxsource — I've moved the fix into its own topic so it's easier to find and follow: Mp3tag Proxy, a small free Windows tool that works around the Cloudflare block so your tag-source scripts work again.
Mp3tag Proxy — fixes Cloudflare 403 for Beatport & Traxsource web sources (Windows)
Beatport recently tightened its Cloudflare protection, and the latest version (v2.1.0) handles it. Questions and feedback welcome over there. 