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Hi Naresh,
Welcome to the Microsoft Q&A forum.
Based on your description, you would like to transfer Visio 2021 Professional to a new computer. You also mentioned that you still have the Product Key.
In this case, you do not need the email account to uninstall the software from your computer.
You can go to Settings > Apps > Installed apps, locate Microsoft Visio, and uninstall the application.
Once the uninstallation is complete, you can install Visio on the new computer and activate it using your existing Product Key.
You may refer to the following documentation:
Transfer your Office license to another device or another person | Microsoft Support
If you encounter any difficulties during the process, please let me know exactly which step you are having trouble with. Are there any error messages appearing during the process? If so, please share them with me, and I will be happy to assist you further.
I look forward to continuing the conversation.
If the answer is helpful, please click "Yes" and kindly upvote it.
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