Source

File: wp-admin/includes/class-wp-theme-install-list-table.php

public function install_theme_info( $theme ) {
		global $themes_allowedtags;

		if ( empty( $theme ) ) {
			return;
		}

		$name   = wp_kses( $theme->name, $themes_allowedtags );
		$author = wp_kses( $theme->author, $themes_allowedtags );

		$install_url = add_query_arg(
			array(
				'action' => 'install-theme',
				'theme'  => $theme->slug,
			),
			self_admin_url( 'update.php' )
		);

		$update_url = add_query_arg(
			array(
				'action' => 'upgrade-theme',
				'theme'  => $theme->slug,
			),
			self_admin_url( 'update.php' )
		);

		$status = $this->_get_theme_status( $theme );

		?>
		<div class="install-theme-info">
		<?php
		switch ( $status ) {
			case 'update_available':
				printf(
					'<a class="theme-install button button-primary" href="%s" title="%s">%s</a>',
					esc_url( wp_nonce_url( $update_url, 'upgrade-theme_' . $theme->slug ) ),
					/* translators: %s: Theme version. */
					esc_attr( sprintf( __( 'Update to version %s' ), $theme->version ) ),
					__( 'Update' )
				);
				break;
			case 'newer_installed':
			case 'latest_installed':
				printf(
					'<span class="theme-install" title="%s">%s</span>',
					esc_attr__( 'This theme is already installed and is up to date' ),
					_x( 'Installed', 'theme' )
				);
				break;
			case 'install':
			default:
				printf(
					'<a class="theme-install button button-primary" href="%s">%s</a>',
					esc_url( wp_nonce_url( $install_url, 'install-theme_' . $theme->slug ) ),
					__( 'Install' )
				);
				break;
		}
		?>
			<h3 class="theme-name"><?php echo $name; ?></h3>
			<span class="theme-by">
			<?php
				/* translators: %s: Theme author. */
				printf( __( 'By %s' ), $author );
			?>
			</span>
			<?php if ( isset( $theme->screenshot_url ) ) : ?>
				<img class="theme-screenshot" src="<?php echo esc_url( $theme->screenshot_url ); ?>" alt="" />
			<?php endif; ?>
			<div class="theme-details">
				<?php
				wp_star_rating(
					array(
						'rating' => $theme->rating,
						'type'   => 'percent',
						'number' => $theme->num_ratings,
					)
				);
				?>
				<div class="theme-version">
					<strong><?php _e( 'Version:' ); ?> </strong>
					<?php echo wp_kses( $theme->version, $themes_allowedtags ); ?>
				</div>
				<div class="theme-description">
					<?php echo wp_kses( $theme->description, $themes_allowedtags ); ?>
				</div>
			</div>
			<input class="theme-preview-url" type="hidden" value="<?php echo esc_url( $theme->preview_url ); ?>" />
		</div>
		<?php
	}