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I have purchases adobe premiere pro and installed the same. Why version 15.1 have got installed why not version 15.4 or above
Make sure the CC desktop app is up to date.
Sign out, reboot, sign in might help.
Under Help dropdown menu inside Premiere there is an option Updates.
Also make sure your machine meets minimum system requirements.
Adobe Premiere Pro CC System Requirements
It could also be an issue with your operating system.
If your OS isn't up to date you won't be able to install newer versions of applications.
You should check the link Ann added.