MU Online Launcher (Professional) — Lifetime License 50€ (1 Domain)
Price: 50 EUR — lifetime license for ONE domain.
Domain change: NOT allowed. If you need another domain — it is a new order.

What this launcher does

• Stable MU Online start without hassle — clean UI, fast launch, no manual patching.
  
• Loads config from API — servers list, UI text, verify settings, news sections.
  
• News system — categorized news (sections + items), readable inside launcher.
  
• Smart patching — verifies local files and downloads only changed files (manifest-based).
  
• SHA-256 verification — prevents broken/corrupted updates.
  
• Client settings in one place — windowed/fullscreen, resolution, sound presets (auto apply).
  
• Account saving — optional auto-save for faster login.
  
• Server-side client verification before start — block/allow by CRC32 rules.
  
• Multi-server support — each server can have its own EXE name, paths, patch folder and manifest.
  

API Features (api.php)
This launcher uses a simple API with 2 main routes:





1) GET api.php?r=config
Returns launcher configuration in JSON:

• title — launcher title
  
• ui.start_text — start button text
  
• settings.verify_time_window_sec — allowed time window for verify request (anti-replay)
  
• settings.block_if_crc_unknown — block if CRC is not whitelisted
  
• servers — server list (filtered by access rules)
  
• news_sections — news sections + items
  

Access modes per server (access):

• 0 = disabled (hidden)
  
• 1 = public (visible for everyone)
  
• 2 = IP whitelist (visible only for allowed IPs)
  

2) GET api.php?r=verify&sid=SERVER_ID&file=main.exe&crc32=XXXXXXXX&ts=UNIX_TIME
Checks if the client EXE is allowed to run:

• Validates server id (sid)
  
• Validates file name (must match server EXE)
  
• Validates CRC32 format (8 hex)
  
• Validates timestamp (ts) inside allowed window
  
• Checks CRC32 against allowed_crc32
  
• If block_if_crc_unknown=true → unknown CRC is blocked
  

Returns:

• {allowed:true, message:"OK"} OR {allowed:false, message:"CRC not allowed"}
  

Admin Panel (admincp.php)

• Login protected (password hash)
  
• Edit launcher.json safely (atomic save + file lock)
  
• Manage servers:
  
  • Add / delete / reorder servers
  • Set server name, EXE name, EXE path, CWD
  • Set access mode and allowed IPs
    
  • Set expected_crc32 and allowed_crc32 whitelist
    
  • Set manifest URL override (optional)
• Manage news sections and news items (date/title/tag/body)
  
• Patch system per server:
  
  • Auto creates folders: /patch/{sid}/files/
    
  • Builds manifest.json with SHA-256 + size + mtime
    

License Terms

• Lifetime for ONE domain — 50€
  
• Domain change is forbidden (new domain = new order)
  
• You can create unlimited servers inside the same licensed domain

Contact / Order
Write me in PM with your domain and server details.

Perfect solution for Game Client :) Thanks!

Perfect solution for Game Client :) Thanks!

Thanks <3