Hi Ravi1988,
Once an MST is applied during an install, another MST can’t be used later during an update (say, to change one setting).
The way the Windows Installer Technology works is that during an update or repair, the installer references the MST file that the installation used when it was first installed.
The only way to use a different MST is to uninstall the product and then reinstall with a new MST file.
So, I would suggest you to try completely uninstalling Acrobat (PRO DC & Reader DC) and then reinstall creating a new MST.
Let us know if this helps.