I am not sure if 4.8 or 4.8.0 is correct version numbers but i assume 4.8 is incorrect and 4.8.0 is correct since the website redirects but i might be wrong so please only correct to what ever the correct thing is. This is just a suggestion to fix broken link (404 Not found)...

.htaccess says:
    # for correcting the version number style
    Redirect 301 /download/changelogs/4.8 http://www.xfce.org/download/changelogs/4.8.0

So perhaps change file name (so don't get 404 not found):
    /download/changelogs/4.8
>
    /download/changelogs/4.8.0

And perhaps in https://www.xfce.org/download/changelogs change:
    Xfce 4.8
    4.8
>
    Xfce 4.8.0
    4.8.0

In /pages/download/changelogs/index.php there is this line:
        '/^4\.8(|pre)/' => R_('Xfce 4.8'),
Perhaps change to:
        '/^4\.8(|pre)/' => R_('Xfce 4.8.0'),


-----------------------------------------------------------------


--- a/pages/download/changelogs/index.php
+++ b/pages/download/changelogs/index.php
@@ -5,7 +5,7 @@ $head['title'] = R_('Changelogs');
 $major_versions = array (
         '/^4\.12(|pre)/' => R_('Xfce 4.12'),
         '/^4\.10(|pre)/' => R_('Xfce 4.10'),
-        '/^4\.8(|pre)/' => R_('Xfce 4.8'),
+        '/^4\.8(|pre)/' => R_('Xfce 4.8.0'),
         '/^4\.[56]\./' => R_('Xfce 4.6'),