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Cad20 19 cannot be installed.

The version of W7 system you are using now is low, just like XP before, which is divided into SP 1 and SP2. Version W7 SP 1 can be installed, and the upgrade package of SP 1 can be downloaded online. Input: dxdiag to check the version number, 7600 is the old version W7, 760 1 is the version W7 of SP 1, and only 760 1 is SP 1 can be installed.

Net. Framework. Runtime 4.7