Thank you for your question and reaching out. I can understand you are having query\issues related to IPAM using RSAT tool.
Please try to download RSAT from this link : https://www.microsoft.com/en-in/download/details.aspx?id=45520
Alternatively you can also use Windows Admin Center : https://learn.microsoft.com/en-us/windows-server/manage/windows-admin-center/overview
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