The annual Texas School Directory has been published in some form for decades. Starting with the 1999-2000 school year edition, they are available online for download. Some versions are available in tagged ("screen reader enabled") and non-tagged (smaller file) versions.
Select Reports and Directories > Texas School Directories.
Click the desired year. A page appears with links to PDF files for the entire directory and for its individual sections:
Click the desired link to open the PDF file. Alternatively, you can right-click the link, then select Save Target As... (or the equivalent in your browser), then follow the prompts to download and save the file.