I don’t think so. The main difference between ACF and ACF Pro is the number of fields available, not the functionnality in itself. Even, not showing the ACF Pro menu without licence key would be a nonsens as this would be then impossible to fill the key to activate ACF Pro 😉
I’m not an expert but I would say that there is another code section that hide your ACF menu or maybe a compatibility issue with another plugin.
As explain, you can start to try access the page directly (http://www.yoursite.com/wp-admin/edit.php?post_type=acf) to see if ACF is running. With the website I’m working on, the address is now (http://www.yoursite.com/wp-admin/edit.php?post_type=acf-field-group) so try both to be sure.
If this is working, that’s means ACF is on and you have to understand in code why it’s hidden in the menu. If it’s not working, I would start to disabled all plugin except ACF and see if this is back.
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