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Launch Setup:
For a direct ISO file that can be used for a full installation (requires your own license key), community-contributed archives are the most reliable remaining sources: Internet Archive (Standard Edition) sql server 2008 r2 standard edition 64 bit iso
If you must maintain a legacy system, ensure your environment meets these minimum specifications for the 64-bit Standard edition: Windows and SQL Server 2008/R2 End of Support - Bytes Select
Run Windows Update immediately—the ISO does not include any service packs. You need: sql server 2008 r2 standard edition 64 bit iso