You can download the installation from following Link. I downloaded my copy from Microsoft volume licencing.
When you download the ISO you need to extract the files on some location and once done you can follow step by step:
Step 1: Once the files are downloaded we need to start the setup by running the Orchestrator setup.exe.
Step 2: Once you run the setup you will get the following screen click on install.
Step 3: Enter the licencing details.
Step 4: Accept the Eula.
Step 5: Click Next.
Step 6: I am installing all components on one server as this is a test environment. In production you can install different components on different servers. Once done click next.
Step 7: Once you click next it will check the pre-requisites and if something is missing you can fix just by checking the tick box as displayed. Once done click next.
Step 8: It will then install the missing components.Once pre-requisites are installed click next.
Step 9: Once done enter the credentials and click next.
Step 11: Enter the database information.
Step 12: A new database will be created. Click next.
Step 13: Verify the user group ad click next.
Step 14: The default ports are 81 and 82. If you want you can specify accordingly but the recommended ports are 81 and 82.Once checked click next.
Step 15: You can change the location as per your preference.
Step 16: If you are using SCCM to patch then you can select the 2nd option else select the first option and click next.
Step 17: Click next.
Step 18: You will get the summary of all the action performed so far. Please verify and click install.
Step 19: The installation will start and will look like the following.
Step 20: The setup is now complete.