Download all of my files from Plone

Andreas, thank you.

I tried to install collectiveexportimport but I keep getting an error. I am using Plone 5.1

eggs +=
   collective.exportimport
   plone.restapi

zcml =
  collective.exportimport
Error message:
Installing client1.
Couldn't find index page for 'collective.exportimport' (maybe misspelled?)
Getting distribution for 'collective.exportimport'.
Couldn't find index page for 'collective.exportimport' (maybe misspelled?)
While:
  Installing client1.
  Getting distribution for 'collective.exportimport'.
Error: Couldn't find a distribution for 'collective.exportimport'.

Please advise. Thanks so much.