Installation Troubleshooting

We tried our best to keep the installation simple and intuitive. For general installation troubleshooting please visit the Installation and Setup Forum:

The following shows some common installation errors:

Error #1: Installation Error .Net Framework 3.5 is not installed

This problem shows because sql server express requires .net framework 3.5 installed in the system. This is not installed by default in many systems. In most cases it will be installed with the Windows Update.

Windows Server 2012-R2

  1. Restart the Computer
  2. Grab a copy of the Windows 2012-R2 DVD and connect it to the machine (e.g. mapped D-Drive). OR
  3. If the Windows 2012-R2 DVD is not available, you can also download the trial ISO of the same OS from the Microsoft Website (currently available at, then mount the ISO file to a drive e.g. D-Drive)
  4. Bring up a command prompt in administrator mode and then run the following command:
    dism.exe /online /enable-feature /featurename:NetFX3 /Source:D:\sources\sxs /all
    Assuming the DVD/ISO is installed as D-Drive

Windows 2016, Windows 2019 or Windows 10

  1. In most cases the error will also show a link to install the .net 3.5 on your computer. if so, click on the link and reboot the computer.
  2. If the above option is not shown or if the .net 3.5 installation shows errror, follow the steps above for Windows 2012-R2 (select the correct operating system DVD (or ISO from the microsoft eval site)