Index: wp-admin/edit-form-blocks.php
===================================================================
--- wp-admin/edit-form-blocks.php	(revision 56577)
+++ wp-admin/edit-form-blocks.php	(working copy)
@@ -320,12 +320,25 @@
 	<div class="wrap hide-if-js block-editor-no-js">
 		<h1 class="wp-heading-inline"><?php echo esc_html( $title ); ?></h1>
 		<?php
-		$message = sprintf(
-			/* translators: %s: A link to install the Classic Editor plugin. */
-			__( 'The block editor requires JavaScript. Please enable JavaScript in your browser settings, or try the <a href="%s">Classic Editor plugin</a>.' ),
-			esc_url( wp_nonce_url( self_admin_url( 'plugin-install.php?tab=favorites&user=wordpressdotorg&save=0' ), 'save_wporg_username_' . get_current_user_id() ) )
-		);
+		if ( file_exists( WP_PLUGIN_DIR . '/classic-editor/classic-editor.php' ) ) {
+			// If Classic Editor is already installed, provide a link to activate the plugin.
+			$plugin_activate_url = wp_nonce_url( 'plugins.php?action=activate&amp;plugin=classic-editor/classic-editor.php', 'activate-plugin_classic-editor/classic-editor.php' );
 
+			$message = sprintf(
+				/* translators: %s: A link to activate the Classic Editor plugin. */
+				__( 'The block editor requires JavaScript. Please enable JavaScript in your browser settings, or <a href="%s">Activate Classic Editor</a> Plugin.' ),
+				esc_url( $plugin_activate_url )
+			);
+		} else {
+			// If Classic Editor is not installed, provide a link to install it.
+			$plugin_install_url = wp_nonce_url( self_admin_url( 'update.php?action=install-plugin&plugin=classic-editor' ), 'install-plugin_classic-editor' );
+			$message = sprintf(
+				/* translators: %s: A link to install the Classic Editor plugin. */
+				__( 'The block editor requires JavaScript. Please enable JavaScript in your browser settings, or <a href="%s"> Install Classic Editor</a> Plugin.' ),
+				esc_url( $plugin_install_url )
+			);
+		}
+
 		/**
 		 * Filters the message displayed in the block editor interface when JavaScript is
 		 * not enabled in the browser.