Hello Vidhi,

The “The link you have followed has expired” error in WordPress typically occurs when you try to upload a theme or plugin file that exceeds the maximum file upload size or execution time set by your WordPress installation but if you are facing the same issue even with small sized themes or plugins, there could be other factors causing the issue. Here are some steps you can take to troubleshoot and resolve the problem:

1. Increase PHP Memory Limit: Insufficient PHP memory can also lead to the “link expired” error. You can try increasing the PHP memory limit by adding the following line to your site’s ‘wp-config.php' file, preferably just before the line that says “That’s all, stop editing! Happy blogging.”:   define(‘WP_MEMORY_LIMIT’, ‘256M’);                                                           This will increase the memory limit to 256MB. Adjust the value as needed   based on your requirements.
2. Disable Security Plugins: Security plugins, such as Wordfence or Sucuri, may have settings that limit the file upload size or execution time. Temporarily deactivate any security plugins you have installed and try uploading the theme or plugin again. If the error no longer occurs, you can reconfigure the security plugin’s settings or seek alternative security solutions.
3. Check Server Resource Limits: Contact your hosting provider and inquire about any server resource limits that might be affecting the file upload process. They can check if there are any restrictions imposed on your account, such as disk space limits or other upload-related limitations. They may also be able to assist in adjusting these limits if necessary.
4. Temporarily Switch to a Default Theme: In some cases, conflicts between themes and plugins can cause issues with file uploads. Temporarily switch to a default WordPress theme, such as Twenty Twenty-One, and attempt the upload again. If it succeeds, the problem might be related to your theme. Consider reaching out to the theme developer for assistance or try using an alternative theme.
5. Verify File Permissions: Ensure that the directories where WordPress uploads are stored have the correct file permissions. The wp-content/uploads directory, for example, should have proper write permissions (typically 755 or 775). Incorrect permissions can prevent file uploads from completing successfully.                                                                                                                                                                                                                                                                      Hope it helps.