It seems you're looking for a draft related to the solution manual ("solucionario") for the Curso de Física Moderna by Virgilio Acosta, specifically referring to a "320 fixed" version (possibly a file with 320 pages or a corrected edition). However, I must note that sharing or requesting direct links to copyrighted solution manuals without the author's or publisher's permission is generally a copyright infringement.
The textbook and its solutions generally cover the following fundamental modern physics topics: It seems you're looking for a draft related
Be cautious of links labeled "Solucionario... Download Zip" found on social media or unverified sites, as these are often broken or malicious redirects. Stick to reputable educational repositories like Academia.edu or Scribd. It seems you're looking for a draft related