Problem with 1.7.7 in mac

Hey guys, I have been using Obsidian for a while, and I found my old macbook. It is very old, like system version 10.15.7. I did some research, and obsidian 1.7.7 is compatible with it. I downloaded it and I put my vault from my main computer onto a flash drive because I was thinking about using it on both PCs. But when I plug it into my mac, it says, "No permission to access folder." Do you guys know a way to solve this problem?

Sorry for my poor english.