No, plugin files and customer support are both available exclusively through this website (permalinkmanager.pro), and it is the only place where you can get them from an official source. This website belongs to the developer of the Permalink Manager Pro plugin, who also provides direct technical support to all customers who have a valid key.
Be wary of GPL websites that distribute copies of popular WordPress plugins. The plugin files published on other suspicious-looking websites may include malicious or outdated code that might infect your website.