Came to the forum to post a question about this issue, and it looks I’m not the only one. Since I and my wife really like antergos (yes, OS has some issues, but it’s still great), she asked to install antergos on her laptop (currently running Mint).
Downloaded v18.9 yesterday, created bootable USB, booted and… exactly the same error:
Error loading \EFI\archiso\vmlinuz: Not found
Failed to execute Antergos Live System (USB) (\EFI\archiso\vmlinuz: Not found)
Failed to start loader.efi (14) Not Found
I don’t think it’s a problem with your system. The laptop I used is Lenovo E50-80 with Intel i5 CPU, and it’s surely not secure boot fault. Secure boot was enabled during my first installation attempt, and I didn’t even come close to boot screen. Laptop simply displayed message “this boot is not supported” or something similar and refused to even display boot menu. Right after I disabled secure boot, I was able to boot from USB, selected “Antergos Live System (USB)” and… the same error as yours.
Thankfully, I can at least load installer when selecting “Antergos Live System CD/DVD”, but I didn’t proceed to actual installation yet. But, according to complains at the forum, installer won’t work anyways because of meta download bug in 18.9. SO I guess my choice is to use 18.8 now.
P.S. Was initial boot menu changed in 18.9. I installed antergos on 2 computers in the past (I think v18.4 and 18.6) and I never saw boot menu with so many options as now. However, installations were performed on desktop computers, and this time I’m dping it on laptop, maybe that’s the reason boot menu is totally different?