Github release zip package File crash


I am using github for an PCB deign project using Altium, On a private repository, I have serveral pre release. But when I download any release Zip, then, I can’t open Altium project and Pdf files, but text file works ok.

Then for testing, I pre release to last commit, and check, then pre released zip is not working, but when I download repository directly, then there is no issue in files.

This is a major issue for me, as I depend on release backup.

Please help me to solve this issue.

Thank You