Tern demo can't load acorn modules

[eltoder]

Opening https://codemirror.net/demo/tern.html prints errors in js console:

tern.html:17 GET https://ternjs.net/node_modules/acorn/dist/acorn_loose.js net::ERR_ABORTED 404 (Not Found)
tern.html:18 GET https://ternjs.net/node_modules/acorn/dist/walk.js 404 (Not Found)
infer.js:1090 Uncaught TypeError: Cannot read property 'make' of undefined
    at infer.js:1090
    at infer.js:21
    at infer.js:22
(anonymous) @ infer.js:1090
(anonymous) @ infer.js:21
(anonymous) @ infer.js:22
infer.js:869 Uncaught TypeError: def.load is not a function
    at infer.js:869
    at Object.exports.withContext (infer.js:883)
    at new exports.Context (infer.js:851)
    at exports.Server.reset (tern.js:153)
    at new exports.Server (tern.js:130)
    at new CodeMirror.TernServer (tern.js:66)
    at tern.html:114
    at XMLHttpRequest.xhr.onreadystatechange (tern.html:104)

Tern addon on the page doesn't work (no completions or tooltips), presumably as a result of these errors.
Tested in Chrome 70 on Windows.