Why can’t I use XMind desktop version to open mind maps created on my Android mobile device?

XMind: ZEN and XMind 8 Update 3 or later version can open a mind map created with XMind Mobile.
 
You can check the version of XMind 8 in Help > About XMind.

If the version of your XMind 8 is below Update 3, please update your XMind 8 and then try again.
 
You can download XMind 8 Here.
You can download XMind: ZEN Here.