TGM 'Warning: sprintf(): Too few arguments...' bugfix

class-tgm-plugin-activation.php

/**
					 * Sets install skin strings for each individual plugin.
					 *
					 * Checks to see if the automatic activation flag is set and uses the
					 * the proper strings accordingly.
					 *
					 * @since 2.2.0
					 */
					public function add_strings() {
						if ( 'update' === $this->options['install_type'] ) {
							parent::add_strings();
							/* translators: 1: plugin name, 2: action number 3: total number of actions. */
							$this->upgrader->strings['skin_before_update_header'] = __( 'Updating Plugin %1$s (%2$d/%3$d)', 'tgmpa' );
						} else {
							/* translators: 1: plugin name, 2: error message. */
							$this->upgrader->strings['skin_update_failed_error'] = __( 'An error occurred while installing %1$s: <strong>%2$s</strong>.', 'tgmpa' );
							/* translators: 1: plugin name. */
							$this->upgrader->strings['skin_update_failed'] = __( 'The installation of %1$s failed.', 'tgmpa' );

							if ( $this->tgmpa->is_automatic ) {
								// Automatic activation strings.
								$this->upgrader->strings['skin_upgrade_start'] = __( 'The installation and activation process is starting. This process may take a while on some hosts, so please be patient.', 'tgmpa' );
								/* translators: 1: plugin name. */
								$this->upgrader->strings['skin_update_successful'] = __( '%1$s done.' );
								$this->upgrader->strings['skin_upgrade_end']       = __( 'All installations and activations have been completed.', 'tgmpa' );
								/* translators: 1: plugin name, 2: action number 3: total number of actions. */
								$this->upgrader->strings['skin_before_update_header'] = __( 'Installing and Activating Plugin %1$s (%2$d/%3$d)', 'tgmpa' );
							} else {
								// Default installation strings.
								$this->upgrader->strings['skin_upgrade_start'] = __( 'The installation process is starting. This process may take a while on some hosts, so please be patient.', 'tgmpa' );
								/* translators: 1: plugin name. */
								$this->upgrader->strings['skin_update_successful'] = __( '%1$s done.' );
								$this->upgrader->strings['skin_upgrade_end']       = __( 'All installations have been completed.', 'tgmpa' );
								/* translators: 1: plugin name, 2: action number 3: total number of actions. */
								$this->upgrader->strings['skin_before_update_header'] = __( 'Installing Plugin %1$s (%2$d/%3$d)', 'tgmpa' );
							}
						}
					}

hello, i changed that text, but still facing that warning, can you help me?please,

now working.

sorry... I can't make it work in 2.6.1

Wordpress 4.9.5, TGM 2.6.1. It's work, thanks.

Thank you it works fine for me. Version 2.6.1 WP 4.9.8

works for me. thanks

Version 2.6.1 WP 5.1

Bingoo Its works fine.thank you .

Thank's, it's work for my theme 👍

I am facing this issue on 5.7.2 and this gist didn't fix it.

Solution:
In the add_strings() method, change the value of the $this->upgrader->strings['skin_update_successful'] property by removing the onclick="%2$s".

Solution: In the add_strings() method, change the value of the $this->upgrader->strings['skin_update_successful'] property by removing the onclick="%2$s".

It's worked for me, thanks