If you are looking for a program to manage accounting under the Simplified Taxation System (USN/УСН), the most reliable option is . While many users search for a way to "download" (skachat) a free version, it is important to distinguish between educational versions and commercial software. Official Ways to Get 1C for USN
: You don't need to download and install software with the 1C:Fresh cloud service. It allows you to work via a web browser and usually offers a free trial period.
: This is a specialized basic version pre-configured for USN. It features a simplified interface that only shows elements relevant to the simplified tax system.