Depending on the type of license: For free-to-play pc games, it is a common way for publishers to obtain a new player base and attract a certain audience. In the same way, these are usually released for Windows, Linux, OSX and Android. For demos, they are common for testing purposes before publishing the full product. They can also be downloaded from web or app stores. For web and apps developers, it is a test-and-learn mode to check if the developer needs to develop his own software, or if he can use pre-built products like Inno Setup. It’s very common to download and install the software installed in the computer's browser. For certified software, it's a process to make sure that programs or codes are tested on a network of certified computers before releasing it.
A free demo is almost the same as a fully functional trial, except for lacking some of the features that you receive with a full license. If you would like to try this software before you buy it, a free, functional version is something that you can use. 7211a4ac4a