Download the main "UCCW - Ultimate custom widget" app from the Google Play Store.
Use a tool like apk-signer from the Google Play Store.
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 Download uccw495 sign 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
Open the UCCW app, go to Settings > Backup/Restore, and select the downloaded skin file to import it. Download the main "UCCW - Ultimate custom widget"
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 the specific skin file (often a .uzip file) you wish to use. Steps to Download and Use a UCCW Skin
Use apksigner from the Android SDK build-tools to sign and zipalign the file.