ZeXtras Chat Server не установлен или отключен (not installed or turned off)

Hello.
I have installed http://www.zextras.com/download/zextras_migration_tool-latest.tgz to migrate data from old server to new.
Migration process some freezed and i decided to install to old zimbra server chat.
I have downloaded http://www.zextras.com/download/zextras_suite-latest.tgz and tried to install it:

[root@mail zextras_suite-2.0.3]# ./install.sh core

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Checking for existing installations ...

FOUND Zimbra 8.6.0

Checking whether you are installing the latest version ...

Current release: 2.0.3.0
Latest release: 2.0.3

For more information check the Changelog at
Changelog - ZeXtras Suite Wiki

This installer is up to date: version 2.0.3.0

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Checking whether the Core is already installed ...
Checking whether the ZAL is already installed ...
Checking whether the ZeXtras Suite Zimlet is already installed ...
Checking whether the ZeXtras Migration Tool Zimlet is already installed ...

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Detected ZeXtras Migration Tool Core version 2.0.3.0
Detected ZeXtras Migration Tool Zimlet version 2.0.3
No preexistent ZeXtras Suite Zimlet installation found.

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You have components of ZeXtras Migration Tool installed on your system.
Please remove them before installing ZeXtras Suite.

It seems like Core was already installed when i have installed ZeXtras Migration Tool.
After this i have installed ZeXtras Chat Zimlet, activated it for users and restarted Zimbra Server.
When i log in to my mailbox i see message like "ZeXtras Chat Server не установлен или отключен (not installed or turned off)" and chat don't work.
How i can check status of ZeXtras Chat Server and fix this problem at all?
Tnx.