Why is my theme missing from the installation list or failing to install?

Check that the Themezer item is public and that its download has finished. Download the package again and confirm that its filename ends in .p3t; do not rename a ZIP or another file to make it look like a P3T package.

For USB installation, confirm that the file is directly inside PS3/THEME/ at the root of the drive, then return to Settings → Theme Settings → Theme → Install. If the PS3 still rejects it, the package may be invalid or incompatible with the console. Try a fresh download and contact the theme creator or report the item with the error details.