diff --git a/src/class-tiny-notices.php b/src/class-tiny-notices.php
index 1dd5a0b4..11159744 100644
--- a/src/class-tiny-notices.php
+++ b/src/class-tiny-notices.php
@@ -183,7 +183,7 @@ public function get_api_key_pending_notice() {
 
 	public function add_limit_reached_notice( $email ) {
 		$encoded_email = str_replace( '%20', '%2B', rawurlencode( $email ) );
-		$url = 'https://tinypng.com/dashboard/api?type=upgrade&mail=' . $encoded_email;
+		$url = 'https://tinypng.com/dashboard/api?type=upgrade&mail=' . $encoded_email . '&utm_source=installation&utm_medium=wordpress-plugin';
 		$link = '<a href="' . $url . '" target="_blank">' .
 			esc_html__( 'TinyPNG API account', 'tiny-compress-images' ) . '</a>';
 
diff --git a/src/compatibility/class-tiny-migration.php b/src/compatibility/class-tiny-migration.php
new file mode 100644
index 00000000..01902da3
--- /dev/null
+++ b/src/compatibility/class-tiny-migration.php
@@ -0,0 +1,46 @@
+<?php
+/*
+* Tiny Compress Images - WordPress plugin.
+* Copyright (C) 2015-2018 Tinify B.V.
+*
+* This program is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License as published by the Free
+* Software Foundation; either version 2 of the License, or (at your option)
+* any later version.
+*
+* This program is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+* more details.
+*
+* You should have received a copy of the GNU General Public License along
+* with this program; if not, write to the Free Software Foundation, Inc., 51
+* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+class Tiny_Migration {
+
+    public static function migrate_meta_key_on_update() {
+        $saved_version = get_option('tiny_png_plugin_version');
+
+        if ($saved_version !== TINY_PNG_PLUGIN_VERSION) {
+            global $wpdb;
+
+            $posts = $wpdb->get_results("
+                SELECT post_id, meta_value 
+                FROM {$wpdb->postmeta} 
+                WHERE meta_key = 'tiny_compress_images'
+            ");
+
+            foreach ($posts as $post) {
+                update_post_meta($post->post_id, Tiny_Config::META_KEY, $post->meta_value);
+
+                delete_post_meta($post->post_id, 'tiny_compress_images');
+            }
+
+            update_option('tiny_png_plugin_version', TINY_PNG_PLUGIN_VERSION);
+        }
+    }
+}
+
+add_action('plugins_loaded', array('Tiny_Migration', 'migrate_meta_key_on_update'));
\ No newline at end of file
diff --git a/src/config/class-tiny-config.php b/src/config/class-tiny-config.php
index b58fc922..543737ff 100644
--- a/src/config/class-tiny-config.php
+++ b/src/config/class-tiny-config.php
@@ -9,5 +9,5 @@ class Tiny_Config {
 	const SHRINK_URL = 'https://api.tinify.com/shrink';
 	const KEYS_URL = 'https://api.tinify.com/keys';
 	const MONTHLY_FREE_COMPRESSIONS = 500;
-	const META_KEY = 'tiny_compress_images';
+	const META_KEY = '_tiny_compress_images';
 }
diff --git a/src/views/account-status-connected.php b/src/views/account-status-connected.php
index a47c6446..0026d3ef 100644
--- a/src/views/account-status-connected.php
+++ b/src/views/account-status-connected.php
@@ -64,7 +64,7 @@
 	<div class="update" style="display: none">
 		<h4><?php esc_html_e( 'Change your API key', 'tiny-compress-images' ); ?></h4>
 		<p class="introduction"><?php
-			$link = sprintf( '<a href="https://tinypng.com/dashboard/api" target="_blank">%s</a>',
+			$link = sprintf( '<a href="https://tinypng.com/dashboard/api?utm_source=installation&utm_medium=wordpress-plugin" target="_blank">%s</a>',
 				esc_html__( 'API dashboard', 'tiny-compress-images' )
 			);
 			/* translators: %s: link saying API dashboard */
@@ -90,7 +90,7 @@
 			<div class="button-container">
 				<div class="box">
 					<?php $encoded_email = str_replace( '%20', '%2B', rawurlencode( self::get_email_address() ) ); ?>
-					<a href="https://tinypng.com/dashboard/api?type=upgrade&mail=<?php echo $encoded_email; ?>" target="_blank" class="button button-primary upgrade-account">
+					<a href="https://tinypng.com/dashboard/api?type=upgrade&mail=<?php echo $encoded_email; ?>&utm_source=installation&utm_medium=wordpress-plugin" target="_blank" class="button button-primary upgrade-account">
 						<?php esc_html_e( 'Upgrade account', 'tiny-compress-images' ); ?>
 					</a>
 				</div>
diff --git a/src/views/account-status-create-advanced.php b/src/views/account-status-create-advanced.php
index 6f71693d..97c7e42c 100644
--- a/src/views/account-status-create-advanced.php
+++ b/src/views/account-status-create-advanced.php
@@ -36,7 +36,7 @@
 		?></h4>
 
 		<p class="introduction"><?php
-			$link = sprintf( '<a href="https://tinypng.com/dashboard/api" target="_blank">%s</a>',
+			$link = sprintf( '<a href="https://tinypng.com/dashboard/api?utm_source=installation&utm_medium=wordpress-plugin" target="_blank">%s</a>',
 				esc_html__( 'API dashboard', 'tiny-compress-images' )
 			);
 			/* translators: %s: link saying API dashboard */
diff --git a/src/views/account-status-create-simple.php b/src/views/account-status-create-simple.php
index 9e031b8c..827fdbd6 100644
--- a/src/views/account-status-create-simple.php
+++ b/src/views/account-status-create-simple.php
@@ -2,7 +2,7 @@
 	<div class="update">
 		<h4><?php esc_html_e( 'Configure your account', 'tiny-compress-images' ); ?></h4>
 		<p class="introduction"><?php
-			$link = sprintf( '<a href="https://tinypng.com/developers" target="_blank">%s</a>',
+			$link = sprintf( '<a href="https://tinypng.com/developers?utm_source=installation&utm_medium=wordpress-plugin" target="_blank">%s</a>',
 				esc_html__( 'TinyPNG developer section', 'tiny-compress-images' )
 			);
 
diff --git a/src/views/bulk-optimization-upgrade-notice.php b/src/views/bulk-optimization-upgrade-notice.php
index 44cea25b..0b50a9c2 100644
--- a/src/views/bulk-optimization-upgrade-notice.php
+++ b/src/views/bulk-optimization-upgrade-notice.php
@@ -22,7 +22,7 @@
 		</p>
 	</div>
 	<?php $encoded_email = str_replace( '%20', '%2B', rawurlencode( $email_address ) ); ?>
-	<a href="https://tinypng.com/dashboard/api?type=upgrade&mail=<?php echo $encoded_email; ?>" target="_blank" class="button button-primary button-hero upgrade-account">
+	<a href="https://tinypng.com/dashboard/api?type=upgrade&mail=<?php echo $encoded_email; ?>&utm_source=installation&utm_medium=wordpress-plugin" target="_blank" class="button button-primary button-hero upgrade-account">
 		<?php esc_html_e( 'Upgrade account', 'tiny-compress-images' ); ?>
 	</a>
 	<?php if ( $remaining_credits > 0 ) { ?>
diff --git a/src/views/bulk-optimization.php b/src/views/bulk-optimization.php
index fc24da96..13709ac4 100644
--- a/src/views/bulk-optimization.php
+++ b/src/views/bulk-optimization.php
@@ -170,7 +170,7 @@
 												'a' => array(
 													'href' => array(),
 												),
-											) ), Tiny_Config::MONTHLY_FREE_COMPRESSIONS, esc_html__( 'image sizes', 'tiny-compress-images' ), '<a target="_blank" href="https://tinypng.com/dashboard/api?type=upgrade&mail=' . str_replace( '%20', '%2B', rawurlencode( $email_address ) ) . '">' . esc_html__( ' upgrade here', 'tiny-compress-images' ) . '</a>' );
+											) ), Tiny_Config::MONTHLY_FREE_COMPRESSIONS, esc_html__( 'image sizes', 'tiny-compress-images' ), '<a target="_blank" href="https://tinypng.com/dashboard/api?type=upgrade&mail=' . str_replace( '%20', '%2B', rawurlencode( $email_address ) ) . '&utm_source=installation&utm_medium=wordpress-plugin">' . esc_html__( ' upgrade here', 'tiny-compress-images' ) . '</a>' );
 											?></p>
 										</div>
 									</div>
diff --git a/tiny-compress-images.php b/tiny-compress-images.php
index 66c6ec79..41c45159 100644
--- a/tiny-compress-images.php
+++ b/tiny-compress-images.php
@@ -9,6 +9,9 @@
  * License: GPLv2 or later
  */
 
+define('TINY_PNG_PLUGIN_VERSION', '3.4.4');
+
+require dirname( __FILE__ ) . '/src/compatibility/class-tiny-migration.php';
 require dirname( __FILE__ ) . '/src/config/class-tiny-config.php';
 require dirname( __FILE__ ) . '/src/class-tiny-helpers.php';
 require dirname( __FILE__ ) . '/src/class-tiny-php.php';