ATA Lightweight installation is straightforward. We can install it using the following steps:

1. Log in to the domain controller as domain admin or enterprise admin.
2. Launch IE and connect to the ATA center URL.
3. Log in to ATA center as administrator:

4. When you log in for the first time, it provides the following page. Click on Download gateway setup and install the first Gateway, as illustrated here:

5. Then it gives you the option to Download Gateway Setup files. Click on the button to begin:

6. After the download completes, extract the ZIP file and run the Microsoft ATA gateway Setup.exe.
7. On the initial page, select the relevant language and click on Next to continue.
8. In the next window, it will give you a confirmation about Gateway deployment type. By default, it detects the type as Lightweight Gateway. Click on Next to proceed with the installation:

9. In the next window, we can specify the Installation Path, Gateway Service SSL Certificate information, and account details to register the gateway with the ATA center. This account should be a member of the ATA administrator group. After you type in the data, click on Install to begin the installation:

10. Once installation is completed, we can see the new gateway successfully connected with ATA center:

This completes the initial ATA deployment and it's ready to rock.