Use apksigner from the Android SDK build-tools to sign and zipalign the file.

Long-press on your home screen, select Widgets, and choose a UCCW widget size. Select the imported skin from the list. Signing an APK

Note: As UCCW is not maintained, consider trying alternatives like "Widgets by You" if experiencing issues. If you want to know more, I can: Show you where to Guide you through manually signing the apk with a computer Explain how to fix weather display issues in UCCW Let me know which option is most helpful! apk-signer - Apps on Google Play

If the skin comes as an APK file (or you are customizing an APK), you may need to sign it to install it on your device.

Use a tool like apk-signer from the Google Play Store.

UCCW (Ultimate Custom Widget) is a widely used Android framework for creating and customizing widgets, though it is no longer officially maintained. The "uccw495" likely refers to a specific version or skin, often shared by users to personalize home screens with clocks, weather, and battery information.