Don't worry! I was also frustrated by the fact that there is only a macOS version available, but after a little digging, I found this on their FAQ:
Q: What platforms does Zed support?
A: As of now, we only support macOS.
[...]
As a general timeframe, you can expect us to begin work on supporting these platforms [Linux and Windows] after Zed is open source, but before version 1.0. Any news will be posted to our platform-tracking issues.
See also this issue. It seems like they have already begun making a Linux version.