| Issue | Likely Cause | Solution | |-------|--------------|----------| | "403 Forbidden" | Proxy IP is also blocked | Change to a residential or less common proxy | | Downloads stop at 99% | Proxy doesn't support resuming | Use SOCKS5 or a VPN | | Captcha loop | The proxy IP is flagged as spam | Switch to a clean proxy or use a VPN | | Slow speed | Free proxy overload | Limit downloads to off-peak hours (midnight) |