nodejs v15 is NOT supported

I can't seem to run hsd on mac.
Already ran npm install and also reinstalled leveldown but no luck.
Any suggestions?

Followed instructions from: https://handshake.org/claim/

OS: Mac Big Sur (11.2.2)
leveldown@5.6.0
node@v15.11.0

```
takuma@MacBook-Pro hsd % ./bin/hsd --log-level info
/Users/takuma/Documents/vscode Projects/handshake/hsd-2.3.0/hsd/node_modules/loady/lib/loady.js:156
throw err;
^

Error: Cannot find module 'leveldown.node'
at moduleError (/Users/takuma/Documents/vscode Projects/handshake/hsd-2.3.0/hsd/node_modules/loady/lib/loady.js:154:15)
at resolve (/Users/takuma/Documents/vscode Projects/handshake/hsd-2.3.0/hsd/node_modules/loady/lib/loady.js:89:9)
at load (/Users/takuma/Documents/vscode Projects/handshake/hsd-2.3.0/hsd/node_modules/loady/lib/loady.js:99:16)
at Object. (/Users/takuma/Documents/vscode Projects/handshake/hsd-2.3.0/hsd/node_modules/bdb/lib/level.js:9:33)
at Module._compile (node:internal/modules/cjs/loader:1092:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1121:10)
at Module.load (node:internal/modules/cjs/loader:972:32)
at Function.Module._load (node:internal/modules/cjs/loader:813:14)
at Module.require (node:internal/modules/cjs/loader:996:19)
at require (node:internal/modules/cjs/helpers:92:18) {
code: 'MODULE_NOT_FOUND'
}
```