Plugins not working and settings link not available

I installed this plugin and activated but its not working. I am not getting acf fields in json response. Additionally settings links is not present on plugins page and there’s no section to select api version on permalink page. However I use this plugin on other website(which was created last month) and its working fine.

I also tried selecting version by setting variable in wp-config.php but no luck. It might not be the issue but to consider difference between two servers, the new one on which plugin works has php version 7.2.7 and other one has 7.1.x.

Is it a bug or something???