TGMPA / TGM-Plugin-Activation

					if ( true === $GLOBALS['wp_filesystem']->move( $from, $to ) ) {

						return trailingslashit( $to );

					} else {

						return new WP_Error( 'rename_failed', esc_html__( 'The remote plugin package does not contain a folder with the desired slug and renaming did not work.', 'tgmpa' ) . ' ' . esc_html__( 'Please contact the plugin provider and ask them to package their plugin according to the WordPress guidelines.', 'tgmpa' ), array( 'found' => $subdir_name, 'expected' => $desired_slug ) );

					}

				} elseif ( empty( $subdir_name ) ) {

					return new WP_Error( 'packaged_wrong', esc_html__( 'The remote plugin package consists of more than one file, but the files are not packaged in a folder.', 'tgmpa' ) . ' ' . esc_html__( 'Please contact the plugin provider and ask them to package their plugin according to the WordPress guidelines.', 'tgmpa' ), array( 'found' => $subdir_name, 'expected' => $desired_slug ) );

				}

					} else {

						return new WP_Error( 'rename_failed', esc_html__( 'The remote plugin package does not contain a folder with the desired slug and renaming did not work.', 'tgmpa' ) . ' ' . esc_html__( 'Please contact the plugin provider and ask them to package their plugin according to the WordPress guidelines.', 'tgmpa' ), array( 'found' => $subdir_name, 'expected' => $desired_slug ) );

					}

				} elseif ( empty( $subdir_name ) ) {

					return new WP_Error( 'packaged_wrong', esc_html__( 'The remote plugin package consists of more than one file, but the files are not packaged in a folder.', 'tgmpa' ) . ' ' . esc_html__( 'Please contact the plugin provider and ask them to package their plugin according to the WordPress guidelines.', 'tgmpa' ), array( 'found' => $subdir_name, 'expected' => $desired_slug ) );

				}

			}

			return $source;