Hello Waqar,
I have proceeded in exactly the same way as you describe, but I have had no success in deactivating the development notes on the live website hidden link.
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I then went back and started from scratch. I uninstalled the OTS installer and reinstalled it again. This works, but it cannot be activated under the WordPress plugins.
I deleted the live domain hidden link under toolset.com and re-entered it. A new license key was created.
I see the problem (presumably) in this:
a/ I confirm under WordPress the command PLUGINS - ADD A NEW PLUGIN
b/ I then select the COMMERCIAL tab.
c/ I click on the UNREGISTER TOOLSET FROM THIS SITE link on the right.
The following message then appears in a pop-up window:
Site-key was set by OTGS_INSTALLER_SITEKEY_TOOLSET, most likely in wp-config.php. Please remove the constant before attempting to unregister.
This message also appears after I delete the command define( 'OTGS_INSTALLER_SITE_KEY_TOOLSET', 'My License key' ); from wp-config.php.
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I have tried all the variants you recommended several times, but I can't get anywhere. I wonder if this has anything to do with the fact that I deactivated and deleted the OTGS installer after restoring the original website (and thus toolset in development status) to the live domain hidden link using a backup tool. I can now install it again, but it can no longer be activated.
Under my toolset account at toolset.com, the new registered live domain hidden link is displayed as if there is no connection to the WordPress website. On all the other development sites that I have set up for testing purposes, I can see which of the Toolset components are active on the website in question by means of green check marks.
This is not the case with the newly registered live domain. I have seen a PUBLISH button and have entered the url of the new domain in a popup window. I also added the command define( 'OTGS_INSTALLER_SITE_KEY_TOOLSET', 'my license key' ); to wp-config.php and clicked the CHECK FOR UPDATES button (under COMMERCIAL) again.
Unfortunately, the original display does not change. The following is still displayed under the start page under hidden link: "This site is registered on Toolset.com as a development site."
Thank you very much for further help.
Mark