Recently I ran into a frustrating issue with Android SDK Manager where it wouldn't display the latest Android versions I wanted to update to. After messing around with a few troubleshooting steps, here are the solutions that actually worked for me—hope they save you some time!

• Verify Enabled Update Sites
  Open the Android SDK Manager and switch to the SDK Update Sites tab. Double-check that the official Android Repository and Google Repository are both checked. It’s easy for these to get unchecked accidentally, and without them, SDK Manager won’t pull in the latest version listings.

• Clear the SDK Manager Cache
  Head to your SDK installation directory (typically ~/Android/sdk on macOS/Linux or C:\Users\<YourUsername>\AppData\Local\Android\Sdk on Windows). Locate the .android folder inside, then delete the cache subfolder. Restart the SDK Manager afterward—it’ll refresh its package list from scratch, which often resolves missing version issues.

• Force a Manual Refresh
  In Android Studio, go to Tools > SDK Manager. Look for the circular refresh icon at the top right of the window and click it. This triggers an immediate re-fetch of available packages, which can kickstart the SDK Manager into showing the latest Android versions if it got stuck.

• Check Your Network Setup
  A spotty internet connection or misconfigured proxy can block SDK Manager from fetching the latest data. Make sure you’re on a stable network, and if you’re behind a corporate proxy, verify that Android Studio’s proxy settings (under File > Settings > Appearance & Behavior > System Settings > HTTP Proxy) are set up correctly.

内容的提问来源于stack exchange，提问作者Sen Alexandru