Most modern Microsoft installers automatically fetch missing components online. However, vs10sp1-x86.msi is from an era where:
Open the mounted drive or extracted folder. Navigate to the packages subfolder. Look for a folder named VS10sp1-KB983509-x86 . Inside, you will find vs10sp1-x86.msi . vs10sp1-x86.msi offline download
Always download directly from Microsoft’s servers. vs10sp1-x86.msi offline download
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