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Download the specific skin file (often a .uzip file) you wish to use.
Download the main "UCCW - Ultimate custom widget" app from the Google Play Store.
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
Long-press on your home screen, select Widgets, and choose a UCCW widget size. Select the imported skin from the list. Signing an APK
Use a tool like apk-signer from the Google Play Store.