Hi Frank,
You need to make sure you have internet access. If you are behind a proxy
you should check
http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Installation#HRunningXW…
. It may also happen that the 
extensions.xwiki.org is down at the moment
you try to run the Distribution Wizard. You should try again a bit later.
Hope this helps,
Marius
On Fri, Jan 22, 2016 at 1:11 PM, Frank Thommen <f.thommen(a)dkfz-heidelberg.de
  wrote: 
  Hi,
 when working through the Distrbution Wizard of our freshly installed XWiki
 Enterprise 7.4 (WEB installation), at step 1 (User Interface) we are faced
 with the following message:
 "
 We couldn't find any extension with id
 'org.xwiki.enterprise:xwiki-enterprise-ui-mainwiki' and version '7.4'.
Make
 sure you have the right extension repositories configured.
 "
 The complete creenshot can be found at 
http://imgur.com/Uc2F9pr.
 I've copied the file
 "org.xwiki.enterprise:xwiki-enterprise-ui-mainwiki-7.4.xar" (from
http://extensions.xwiki.org/xwiki/rest/repository/extensions/org.xwiki.ente…)
 into WEB-INF/extensions to no avail.
 The installation instructions doesn't mention any required step regarding
 the configuration of extensions or extension respositories or where these
 respositories are.  Therefore I'm a little bit at a loss here.
 Our system is running on OpenSuSE 13.1 with PostgreSQL 9.2.14 (from repo),
 Apache Tomcat 8.0.30 (manually installed) and XWiki Enterprise 7.4 (WEB,
 manually installed).
 Any pointer to fix this problem are appreciated.
 Cheers
 Frank
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