XF 1.4 ACP not showing

Interesting. You didnt happen to have any rules in your htaccess protecting this before? I would check the core files (admin.php) and try it with the htaccess file (or any related server rules, nginx etc) removed.
 
Sounds like they reverted to a backup from before you upgraded. You should go to /install/ to complete the upgrade and that may resolve the issue.
 
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