Microsoft distributes MSXML 6.0 Service Pack 3 (which contains the msxml6.dll file) through the Microsoft Download Center. This is the safest and only recommended source for system files.
Always verify the digital signature: Right-click the downloaded .msi > Properties > Digital Signatures tab > Microsoft Corporation should be listed. download best msxml ver 61011 290 for office 2010
If you aren't sure if you have build 6.10.1129.0 installed, you can check manually: Open your File Explorer. Navigate to C:\Windows\System32 . Locate the file named msxml6.dll . Right-click the file and select . Switch to the Details tab. Look for "Product version" or "File version." Troubleshooting Installation Issues Microsoft distributes MSXML 6
Fixing the Office 2010 Install Error: Where to Download MSXML 6.10.1129.0 If you’ve tried to install Microsoft Office 2010 If you aren't sure if you have build 6
If you need the to a specific Microsoft KB article