Fix install-to-casc command

[clanat01]

Pull Request

Fix install-to-casc command when fetching old clients (not available on blizz cdn).

Summary

When installing older clients (like 1.15.2.55140) via cascette install install-to-casc ... command, installing fails with 403 error:

Log

❯ uv run cascette install install-to-casc -r wow_classic_era --platform Windows --region eu d49d4ea6641ecbc6ed675b40146f4f97 a4397d3512438f2db3b8bd3d271b2a41 wow-classic-era
Installation Configuration
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━┓
┃ Category     ┃ Selected     ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━┩
│ Platform     │ Windows      │
│ Architecture │ x86_64       │
│ Locale       │ enUS         │
│ Region       │ EU           │
│ Content      │ speech, text │
└──────────────┴──────────────┘

Initializing CASC storage at: wow-classic-era
Created: Data/data/
Created: Data/indices/
Created: Data/config/
Product: wow_classic_era, Region: eu
CDN client initialized with Ribbit integration

Step 1: Fetching and saving configs...
2026-08-03T19:20:00.982401Z [error    ] cdn_all_mirrors_failed         hash=d49d4ea6641ecbc6ed675b40146f4f97 type=config
2026-08-03T19:20:00.982541Z [error    ] Installation failed            error="Client error '403 Forbidden' for url 'http://level3.blizzard.com/tpr/wow/config/d4/9d/d49d4ea6641ecbc6ed675b40146f4f97'\nFor more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/403"
Error: Installation failed: Client error '403 Forbidden' for url 'http://level3.blizzard.com/tpr/wow/config/d4/9d/d49d4ea6641ecbc6ed675b40146f4f97'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/403

Now, cdn config in command created and passed to cdn client, in order to use correct fallback urls and don't fail in build_config_data fetching in Step 1.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing
  functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test improvements
• Build system/dependency changes

Testing

Tested installing-to-casc command on build 1.15.2.55140.

Tested On

• Linux
• macOS
• Windows

WoW Versions Tested

• Classic Era (1.13.x/1.14.x/1.15.x)
• TBC Classic (2.5.x)
• Wrath Classic (3.4.x)
• Cata Classic (4.4.x)
• MoP Remix (5.5.x)
• Vanilla (1.x)
• TBC (2.x)
• WotLK (3.x)
• Cataclysm (4.x)
• MoP (5.x)
• N/A (not related to WoW file formats)

Quality Checklist

• Code follows project style guidelines
• Self-review of code completed
• Tests pass locally
• Documentation updated (if applicable)

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By submitting this PR, I confirm that:

• I have read and agree to the Contributing Guidelines
• I am willing to address feedback and make necessary changes