diff --git a/htdocs/admin/system/dolibarr.php b/htdocs/admin/system/dolibarr.php
index ee831d92a19..16853706b7d 100644
--- a/htdocs/admin/system/dolibarr.php
+++ b/htdocs/admin/system/dolibarr.php
@@ -102,12 +102,12 @@ print '<tr class="oddeven"><td>'.$langs->trans("CurrentVersion").'<br><span clas
 // If current version differs from last upgrade
 if (!getDolGlobalString('MAIN_VERSION_LAST_UPGRADE')) {
 	// Compare version with last install database version (upgrades never occurred)
-	if (DOL_VERSION != $conf->global->MAIN_VERSION_LAST_INSTALL) {
+	if (DOL_VERSION != getDolGlobalString('MAIN_VERSION_LAST_INSTALL')) {
 		print ' '.img_warning($langs->trans("RunningUpdateProcessMayBeRequired", DOL_VERSION, getDolGlobalString('MAIN_VERSION_LAST_INSTALL')));
 	}
 } else {
 	// Compare version with last upgrade database version
-	if (DOL_VERSION != $conf->global->MAIN_VERSION_LAST_UPGRADE) {
+	if (DOL_VERSION != getDolGlobalString('MAIN_VERSION_LAST_UPGRADE')) {
 		print ' '.img_warning($langs->trans("RunningUpdateProcessMayBeRequired", DOL_VERSION, getDolGlobalString('MAIN_VERSION_LAST_UPGRADE')));
 	}
 }
@@ -116,7 +116,12 @@ $version = DOL_VERSION;
 if (preg_match('/[a-z]+/i', $version)) {
 	$version = 'develop'; // If version contains text, it is not an official tagged version, so we use the full change log.
 }
-print ' &nbsp; <a href="https://raw.githubusercontent.com/Dolibarr/dolibarr/'.$version.'/ChangeLog" target="_blank" rel="noopener noreferrer external">'.$langs->trans("SeeChangeLog").'</a>';
+
+$urlofchangelog = 'https://raw.githubusercontent.com/Dolibarr/dolibarr/'.$version.'/ChangeLog';
+
+print ' &nbsp; ';
+//print dolButtonToOpenUrlInDialogPopup('changelogpopup', $langs->trans("SeeChangeLog"), $langs->trans("SeeChangeLog"), $urlofchangelog);
+print '<a href="'.$urlofchangelog.'" target="_blank" rel="noopener noreferrer external">'.$langs->trans("SeeChangeLog").'</a>';
 
 $newversion = '';
 if (function_exists('curl_init')) {
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 1c8bbedbf57..8abcab0464e 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -2887,13 +2887,19 @@ function dolButtonToOpenUrlInDialogPopup($name, $label, $buttonstring, $url, $di
 		$url .= '?dol_hide_topmenu=1&dol_hide_leftmenu=1&dol_openinpopup=' . urlencode($name);
 	}
 
+	if (preg_match('/^https/i', $url)) {
+		$urltoopen = $url;
+	} else {
+		$urltoopen = DOL_URL_ROOT . $url;
+	}
+
 	$out = '';
 
 	//print '<input type="submit" class="button bordertransp"'.$disabled.' value="'.dol_escape_htmltag($langs->trans("MediaFiles")).'" name="file_manager">';
 	$out .= '<!-- a link for button to open url into a dialog popup -->';
 	$out .= '<a ' . ($accesskey ? ' accesskey="' . $accesskey . '"' : '') . ' class="cursorpointer reposition button_' . $name . ($morecss ? ' ' . $morecss : '') . '"' . $disabled . ' title="' . dol_escape_htmltag($label) . '"';
 	if (empty($conf->use_javascript_ajax)) {
-		$out .= ' href="' . DOL_URL_ROOT . $url . '" target="_blank"';
+		$out .= ' href="' . $urltoopen . '" target="_blank"';
 	} elseif ($jsonopen) {
 		$out .= ' href="#" onclick="' . $jsonopen . '"';
 	} else {
@@ -2910,9 +2916,9 @@ function dolButtonToOpenUrlInDialogPopup($name, $label, $buttonstring, $url, $di
 		$out .= '<script nonce="' . getNonce() . '" type="text/javascript">
 					jQuery(document).ready(function () {
 						jQuery(".button_' . $name . '").click(function () {
-							console.log(\'Open popup with jQuery(...).dialog() on URL ' . dol_escape_js(DOL_URL_ROOT . $url) . '\');
+							console.log(\'Open popup with jQuery(...).dialog() on URL ' . dol_escape_js($urltoopen) . '\');
 							var $tmpdialog = $(\'#idfordialog' . $name . '\');
-							$tmpdialog.html(\'<iframe class="iframedialog" id="iframedialog' . $name . '" style="border: 0px;" src="' . DOL_URL_ROOT . $url . '" width="100%" height="98%"></iframe>\');
+							$tmpdialog.html(\'<iframe class="iframedialog" id="iframedialog' . $name . '" style="border: 0px;" src="' . $urltoopen . '" width="100%" height="98%"></iframe>\');
 							$tmpdialog.dialog({
 								autoOpen: false,
 							 	modal: true,