[Solved] 0x64C(1612) : The installation source for this product is not available. Verify that the source exists and that you can access it.

When attempting an upgrade to newer version, uninstalling or repair, you may receive an error with an exit code of 1603, 1612,  0x8024002D (-2145124307), 0X80240022 (-2145124318).

The error code 1612 is the most useful in determining the underlying reason. When you run CMTrace.exe, it will deliver the results of an error lookup. "The installation source for this product is not available. Verify that the source exists and that you can access it."