acrobat dc not installable on Mac el capitan

as my acrobat dc wouldn't restart after touchdown (tried restarting mac, too), I deinstalled/reinstalled it, but the installation stalled:

Exit Code: 7

Please see specific errors below for troubleshooting. For example, ERROR: DW003, DW006 ...

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

- 0 fatal error(s), 2 error(s)

----------- Payload: Adobe Acrobat DC 15.16.20039.0 Acrobat DC/Acrobat DC Installer.pkg_15.016.20039 -----------

ERROR: DW006: Apple Package failed to install successfully.

ERROR: DW003: Third party payload installer /tmp/3C397FD7-5D24-49E8-9907-FD33E9AD4749/Acrobat_DC_Web_WWMUI/Acrobat DC/Acrobat DC Installer.pkg failed with exit code: 1

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How can I regain a working acorbat dc?