This is the treasure house of China Buddhist scriptures.
There are downloads of Tibetan scriptures such as Dazheng Tibetan.
The following is the download link of the simplified plain text file "Dazhengcang" on this website.
Just play in thunder, just play directly.
/old/cdrom/dzj-j-txt.zip
There is also your classmate's topic, the text of Dazheng Tibetan Buddhist scriptures, which is a typo.
amitabha