Subscription import fails or keeps spinning

When pasting a subscription URL in the Profiles tab of Clash for Windows keeps spinning or reports a download failure, check the following in order:

1. Check the link is copied in full: Subscription URLs are long and carry parameters; a missing tail parameter results in 404. Copy it again completely from the provider's page.
2. Confirm your network works: With no usable proxy active, a blocked subscription domain can stall the download. Try once on a mobile hotspot.
3. Check subscription validity: Log in to your provider's dashboard to confirm the plan is active, traffic is not exhausted, and the device limit is not reached.
4. Import a local file instead: Open the subscription URL in a browser, save the returned YAML as a .yaml file, and drag it in—this bypasses client-side network issues.
5. Try Update All: Click Update All on the Profiles page to force a full refresh.

If none of these work, the problem is likely on the provider's side—contact their support. For concepts, see the tutorial and FAQ.