You can install Sampler and other Creative Cloud apps on up to two computers. If you want to install it on a third computer, deactivate it on one of your previous machines. Learn more about activating and deactivating Creative Cloud apps.
Sampler is a material and environment authoring tool. Sampler has powerful tools to convert images or photographs into tiling materials. Sampler includes many starter assets that you can combine to create unique customized materials. Sampler also has tools to create and edit panoramic environment lights. Use environment lights and materials made with Sampler across Adobe Substance 3D applications, and most other 3D applications thanks to the powerful export tools.
Substance 3D Sampler's documentation has information and solutions for known issues. The documentation is available here.
To get started creating a material from an image, drag an image onto a blank material. Choose Image to Material. The image to material process is covered in this video with multiple methods of dealing with common issues.
First create a new project using one of the methods outlined on this page. With the project open, you can create a new environment light from the Project panel. Click the add icon to the right of the Environment lights header.