Download the main "UCCW - Ultimate custom widget" app from the Google Play Store.
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. Download uccw495 sign apk
Use a tool like apk-signer from the Google Play Store. Download the main "UCCW - Ultimate custom widget"
Use apksigner from the Android SDK build-tools to sign and zipalign the file. Download uccw495 sign apk
For security, it is highly recommended to download UCCW skins from reputable sources like the Google Play Store or Uptodown to avoid malware. Steps to Download and Use a UCCW Skin