Not the right signature file when updating Avast Business Security. How to fix?

Installed it on the enterprise Business Security Avast version 11.2.25.11, on a machine with Windows 7 pro, network on a domain with two proxies, authorization on the proxy in the avast prescribed.

The problem in the following, the AntiVir is not updated (although konekt is), and reports that "it is Not the correct signature file. The installation will be aborted".

Googled this question off the forum there are two threads on this subject, like 2010 and 2011. Both solutions from there in my situation the problem is not solved.

What was done: re-installed, re-installed via the control panel "Remove programs", was held Kaspersky on my computer (found some stuff), Checked with Avast at boot (similar). Downloaded the updates from the antivirus database updated, but after the Internet again the updates do not download.
July 8th 19 at 11:36
1 answer
July 8th 19 at 11:38
and to remove and put again with the online installer?
authentication on the second proxy is also prescribed?
traffic interception worth?

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