Downloaded the Document Server install file from:
How to deploy Document Server on your server?
Only office Help Center (link above)
General system requirements and recommendations are (for Document Server version 3.0 and later):
CPU dual core 2 GHz or better
RAM 2 GB or more
HDD at least 40 GB of free space
OS Microsoft Windows 8, Microsoft Windows 8.1 and later, Microsoft Windows Server 2012(R2) and later
Microsoft .NET Framework: version 3.5;
Internet Information Services: version 7 or later;
MySQL Server: version 5.1 or later;
Node.js: version 0.10.x (32-bit version);
Python: version 2.7;
Microsoft Visual Studio C++ 2010 Express;
Microsoft Visual C++ 2005 Service Pack 1 Redistributable Package MFC Security Update (32-bit version);
Web Browser: Microsoft Internet Explorer 9 or later, latest versions of Mozilla Firefox, Opera, Safari, Google Chrome.
If you want to use Document Server together with Community Server, they must be installed on two different machines.
Install the prerequisites
Find the .exe file you have just downloaded (it will be located in the directory specified at Step 1) and double-click it to start the installation process.
The Prerequisites Wizard will be launched. It will help you to install some prerequisites required to run ONLYOFFICE:
Microsoft Visual C++ 2010 x86 (MFC Security update);
Microsoft Visual C++ Redistributable for Visual Studio 2013 x86;
MYSQL Connector/ODBC 5.3. or higher;
Node.js 0.10.x (32-bit version);
The Prerequisites Wizard automatically checks if the required components are installed on your PC.
The components that are missing on your PC will be checked. Click the Next button and follow the further Wizard instructions to install the missing components. This process may take some minutes.
If the required components are already installed on your PC, the Document Server Setup Wizard will be launched.