I went to Setting > Control Panel\Programs\Programs and Features > Uninstall the broken Microsoft SQL Server Data Tool first. Then, I was able to install it again without any error.
Error while installing Microsoft SQL Server Data Tool Release 15.9.7
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Guoxiong 8,126 Reputation points
2021-04-07T19:13:07.337+00:00 If you have an antivirus program installed from the third party, you may need to disable it when you are installing the SSDT.
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CarrinWu-MSFT 6,851 Reputation points
2021-04-08T02:23:28.93+00:00 Hi @Lee, Wing S. (CCI-Southwest) ,
Welcome to Microsoft Q&A!
Error code 0x80070643 usually means that the packages are not complete and broken. Please clean the %Temp% folder, check and install all the windows update. Reboot your machine, disable all the AV software and firewall to perform a new SSDT installation from Download SQL Server Data Tools. Quote from this link.
Best regards,
Carrin
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