You may need to upload the plugin files via FTP unless your host can configure the server otherwise. Your hosting provider has disabled the function that WordPress uses to manage files when installing and updating plugins. There’s more information about the error in this trac ticket:
The support post ‘Warning: posix_getpwuid() has been disabled’ is closed to new replies.
Have a question about this support post? Create a new support post in our support forums and include a link to this existing support post so we can help you.
Support forum for Event Espresso 3 and Event Espresso 4.