Dota 2 Changer - a program that allows you to change the appearance of characters in Dota 2. It doesn't mean that you get new items and sets for heroes in your Steam inventory. In fact, it simply replaces the model files on the computer, so that the user can put paid items from the Dota 2 store and other cosmetics on the characters for free. The developer of the program states that you will not get an account ban for using Dota 2 Changer, since only cosmetic files are changed. Valve gives no such guarantee, so use the program at your own risk. For such purposes, a "spare" account, which many players have, is a sensible choice for trying it out.
The main drawback of Dota 2 Changer is that the changed character models will only be seen by you. You can't show a beautiful set to your friends: other players see the default items, and the new ability effects that come with Immortal quality items are visible only on your screen.
In addition to the paid items from the store, Dota 2 Changer offers items from modmakers that are not represented in the market. Some of these items are borrowed from the Dota 2 Workshop, and some are exclusive to the program; they are collected in the "Unofficial things" section. The launcher settings let you choose the graphics API (for example DirectX 11), the game version, the interface language and launch parameters. The software itself is free of charge, but you can support the developer by paying for "Premium". All the advantages of a paid subscription are listed in the section of the program with the same name.
Dota 2 Changer allows users to customize their in-game characters' appearance for free, enhancing their game experience.