Here is a story of how that search usually goes down and where those 4th-grade materials actually are: The "Dead Link" Quest

Most teachers have moved these files to Google Drive or Yandex Disk , which are much safer and faster than the old Letitbit days. Why the Shift?

You can still find physical or licensed digital copies of the Buneev 4th Grade set (Part 1 and Part 2) at specialized stores like SBooks or Shkola 2100 outlets.

Imagine it’s 2012. You’re a parent or a teacher looking for the control works. You find a forum link pointing to Letitbit . You click it, wait for the "slow download" timer to tick down from 60 seconds, and finally get your PDF.