The most reliable way to get the v100 toolset is to download the or Professional ISOs from the Microsoft Subscriptions portal (formerly MSDN).
Disclaimer: As Visual Studio 2010 is legacy software, always ensure you are downloading installers from legitimate sources to avoid security risks. Visual Studio 2010 Build Tools V100 Download
The SDK 7.1 compiler lacks atl and mfc (Active Template Library / Microsoft Foundation Classes). If your legacy project uses MFC, you cannot use this method. The most reliable way to get the v100
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