If you would like to have a second In-house EP installation which you are going to use for testing purposes ONLY, then you can make a copy of your existing one and set up a 'clone' on a base of it on the same server. Please be aware that there is no way to easily rollback any global changes made on a production EP account, thus the ONLY meaning of having a second one is a firsthand acquaintance with In-house installation benefits and ability to perform tests of the functionality.
In order to 'clone' your EP account you need to do the following.
Preparation:
1) Back up your existing 'EasyProjects' database using the SQL Server Management Studio:
2) Restore a database from the backup under a different name (e.g. EasyProjects-test) on the same SQL server using the SQL Server Management Studio:
3) Create an empty folder (e.g. EasyProjects-test) at 'c:\inetpub\wwwroot\' where EP files of the second instance will be located;
4) Create a separate application pool (e.g. EP-test) in IIS, choose .NET 4.0 and "Integrated" mode for it;
5) Create a new Web site/application (e.g. EasyProjects-test) in IIS and choose just created application pool to run with it;

6) Make sure you have downloaded the installer of the same version as your original EP In-house installation from:
http://www.easyprojects.net/ep_downloads.asp
Installation:
1) Run the auto-installer in the 'Upgrade' mode;
2) Browse to choose the path to the folder where EP.NET installation files will be created (e.g. c:\inetpub\wwwroot\EasyProjects-test) at the corresponding step of installation process;
3) Enter 'sa' user login credentials and choose the name of the restored database (e.g. EasyProjects-test);
4) Choose the virtual folder/application (e.g. EasyProjects-test) created earlier in IIS;
Finish the installation.
Launching:
1) Open your Internet browser and type the URL of the second EP installation:
http://<yourServerHostname>/EasyProjects-test
2) Make sure that 32bit support is enabled in IIS in case if your Windows server is 64bit:
http://support.myeasyprojects.net/KB/a80/epnet-on-64-bit-windows.aspx?KBSearchID=0Article ID: 157, Created On: 8/17/2011, Modified: 3/5/2012