extension manager cc install fails with error code 15

Been trying to install Extension Manager cc, but keep getting a failed install with an error code 15, and the following error log:

Exit Code: 15

Please see specific errors below for troubleshooting. For example, ERROR:

-------------------------------------- Summary --------------------------------------

- 0 fatal error(s), 0 error(s)

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I'm on a Mac running OS 10.9.4, with 24GBRAM on an 8 core 2.26GHz Xeon Mac Pro.

TIA.

Robin