The official Project64 site no longer distributes 1.5. You may find it on archives like oldversion.com or archive.org .
Q: Can I still download Project64 1.5? A: While it's possible to find older versions of Project64 1.5 online, it's recommended to download the latest version of the emulator from the official website. project 64 1.5
Previous versions had fragile save states that often corrupted. Project 64 1.5 introduced a robust save state system with compression and indexing. You could now quicksave mid-race in Mario Kart 64 or right before a difficult boss in Donkey Kong 64 with 99% reliability. The official Project64 site no longer distributes 1