Running into an error while installing a WordPress theme or plugin is frustrating, but almost every common error has a simple explanation and fix. Here are the ones people run into most often.
“The Package Could Not Be Installed. No Valid Plugins Were Found.”
This is the most common one, and it almost always means WordPress was given the wrong ZIP file. Many products are delivered inside an outer ZIP that contains several things — the actual plugin/theme file, a documentation PDF, license notes, and so on.
Fix: Extract the outer ZIP on your computer first, find the correctly-named plugin or theme ZIP file inside, and upload that specific file instead of the outer folder. See our full installation walkthrough for the correct process.
“Are You Sure You Want to Do This?” / Upload Size Errors
Some hosting environments set a low maximum upload size, which blocks large theme files from uploading through the dashboard.
Fix: Either ask your host to raise the upload_max_filesize and post_max_size PHP limits, or install the file via FTP instead — upload the extracted theme/plugin folder directly into wp-content/themes/ or wp-content/plugins/.
“Destination Folder Already Exists”
This happens when a previous version (or a free version) of the same theme/plugin is still installed under the same folder name.
Fix: Delete the old version first (deactivate it before deleting), then install the new one.
Theme Activates But Looks Broken / Missing Styling
This is usually caused by a missing required plugin, not the theme itself. Many modern themes rely on companion plugins (like a page builder or a demo-content importer) to render correctly.
Fix: Check the theme’s documentation for any “required plugins” notice — WordPress often shows an automatic prompt for this right after activation.
White Screen After Activating a Plugin
Usually a PHP compatibility issue — either the plugin needs a newer PHP version than your host is running, or it conflicts with another active plugin.
Fix: Access your site via FTP and rename the plugin’s folder inside wp-content/plugins/ (adding anything to the folder name deactivates it instantly), which restores access to your dashboard. Then check your host’s PHP version against the plugin’s requirements before reactivating.
Still Stuck?
If none of these match what you’re seeing, reach out through our support contact with a screenshot of the exact error message — that’s usually enough to pinpoint the fix quickly. You may also find it useful to double-check you’re using a genuine, unmodified GPL file, since altered files are a common source of installation problems.