Hi, Suresh 

Thanks for reaching out to us

That error looks strange from the screenshot, i see what you mean.

Can you tell me, i assume that you saw the "update now" button offered,  and when you click it,  the update fails with the error message from your second screenshot?

Can you try to disable the Master Detail add-on first,

and then see if you can try to update it while it's disabled?

If that does not help, please try to follow these steps, as if you were updating the main plugin, 

with manual process to extract the installation folder of Master Details add-on on your FTP, as it is explained on this article :

Updating the plugin to the latest version

If you still can't achieve it, we can investigate the issue for you remotely,

but we will need WP-Admin Administrator user credentials, and credentials for your FTP of this site.

Of course, if you send that, please mark reply as PRIVATE, for security reasons.

Thank you

Hi, Tim 

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

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Can you please open a new ticket, then we can remotely access your back-end of the WordPress,

and we can investigate the issue for you?

We will need access to an Administrator user login, so if you can send us an URL to your site along with Admin username and password,

and please make sure to either open a private ticket,

or if you wish to open a Public ticket, make sure to mark the reply as PRIVATE when you're sending any sensitive data, for security purposes.

Thank you

Hi, Suresh

We are just following up on this.

Let us know if you resolved this issue, and if you successfully updated the Master Details add-on.

If you still see this issue, we can remotely take a look.

Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.