How To: Install IBM Web Sphere Application Server (WAS) For Developers

1. Go to Download Page: https://developer.ibm.com/wasdev/downloads/#asset/WAS_traditional_for_Developers
2. Download IBM Installation Manager and Packaging Utility.
3. After Installation Manager is installed, configure the IBM-hosted repository.

After Installation Manager is installed, configure the IBM-hosted repository.

1. In Installation Manager, go to File > Preferences.
2. In the Repositories panel, click the Add Repository button. Enter the repository URL for the version of WebSphere Application Server that you want to install:
   • Version 9.0: https://www.ibm.com/software/repositorymanager/V9WASILAN
   • Version 8.5: https://www.ibm.com/software/repositorymanager/V85WASDeveloperILAN
   If prompted, authenticate with the IBM-hosted repository using your My IBM id credentials.
   When Installation Manager connects to the repository URL, the connection status icon turns green. 
   Note: these URLs do not work if entered into a browser, they are only for use with Installation Manager.
3. If you want to install IBM HTTP Server, Web Server Plug-ins for WebSphere Application Server, the WebSphere Customization Toolbox which includes the Web Server Plug-ins Configuration Tool, or the WebSphere Application Client, then also add the following composite repository:
   • WebSphere Application Server Supplements V9.0: https://www.ibm.com/software/repositorymanager/V9WASSupplements
   • WebSphere Application Server Supplements V8.5: https://www.ibm.com/software/repositorymanager/V85WASSupplementsILAN
4. Click OK to save the settings and close the Preferences window.

After you configure the repository, use Installation Manager to install WebSphere Application Server and other supplemental software packages.

During "Configure New Server" process, If Eclipse (or MyEclipse) reports "No config file specified", run IBM Profile Management Tool (Click WINDOWS START Button and type "Profile Management")  

REFERENCE:
https://developer.ibm.com/wasdev/downloads/#asset/WAS_traditional_for_Developers