npm install実行時のエラー

お世話になります。Node.js周りの初心者です。

SkyWayさんのSkyWay Conferenceを動作させようとしています。
https://github.com/skyway/skyway-conf

環境：
npm -v
-> 7.10.0
node -v
-> v12.13.1

ReadMeの1番、2番までは順調に設定を行うことができました。

しかし3番の
$ npm install
を行うと以下のように大量にエラーが出てしまいます。

npm ERR! code 1
npm ERR! git dep preparation failed
npm ERR! command /usr/local/bin/node /usr/local/lib/node_modules/npm/bin/npm-cli.js install --force --cache=/Users/k/.npm --prefer-offline=false --prefer-online=false --offline=false --no-progress --no-save --no-audit
npm ERR! > enum@2.3.0 prepublish
npm ERR! > gulp
npm ERR! npm WARN using --force Recommended protections disabled.
npm ERR! npm WARN deprecated request@2.11.4: request has been deprecated, see https://github.com/request/request/issues/3142
npm ERR! npm WARN deprecated forEachAsync@2.2.1: Please use 'foreachasync' instead. See https://www.npmjs.com/package/foreachasync
npm ERR! npm WARN deprecated natives@1.1.6: This module relies on Node.js's internals and will break at some point. Do not use it, and update to graceful-fs@4.x.
npm ERR! npm WARN deprecated left-pad@0.0.3: use String.prototype.padStart()
npm ERR! npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm ERR! npm WARN deprecated to-iso-string@0.0.2: to-iso-string has been deprecated, use @segment/to-iso-string instead.
npm ERR! npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm ERR! npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm ERR! npm WARN deprecated line-numbers@0.2.0: Copy its ~20 LOC directly into your code instead.
npm ERR! npm WARN deprecated graceful-fs@1.2.3: please upgrade to graceful-fs 4 for compatibility with current and future versions of Node.js
npm ERR! npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm ERR! npm WARN deprecated cryptiles@0.2.2: This version has been deprecated in accordance with the hapi support policy (hapi.im/support). Please upgrade to the latest version to get the best features, bug fixes, and security patches. If you are unable to upgrade at this time, paid support is available for older versions (hapi.im/commercial).
npm ERR! npm WARN deprecated chokidar@1.7.0: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm ERR! npm WARN deprecated gulp-util@3.0.8: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
npm ERR! npm WARN deprecated boom@0.4.2: This version has been deprecated in accordance with the hapi support policy (hapi.im/support). Please upgrade to the latest version to get the best features, bug fixes, and security patches. If you are unable to upgrade at this time, paid support is available for older versions (hapi.im/commercial).
npm ERR! npm WARN deprecated sntp@0.2.4: This module moved to @hapi/sntp. Please make sure to switch over as this distribution is no longer supported and may contain bugs and critical security issues.
npm ERR! npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm ERR! npm WARN deprecated fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
npm ERR! npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm ERR! npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm ERR! npm WARN deprecated minimatch@0.3.0: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm ERR! npm WARN deprecated minimatch@1.0.0: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm ERR! npm WARN deprecated mkdirp@0.3.0: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)
npm ERR! npm WARN deprecated mkdirp@0.3.5: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)
npm ERR! npm WARN deprecated mkdirp@0.3.5: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)
npm ERR! npm WARN deprecated gulp-util@2.2.20: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
npm ERR! npm WARN deprecated gulp-util@2.2.20: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
npm ERR! npm WARN deprecated hoek@0.9.1: This version has been deprecated in accordance with the hapi support policy (hapi.im/support). Please upgrade to the latest version to get the best features, bug fixes, and security patches. If you are unable to upgrade at this time, paid support is available for older versions (hapi.im/commercial).
npm ERR! npm WARN deprecated node-uuid@1.4.8: Use uuid module instead
npm ERR! npm WARN deprecated mkdirp@0.5.1: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)
npm ERR! npm WARN deprecated request@2.46.0: request has been deprecated, see https://github.com/request/request/issues/3142
npm ERR! npm WARN deprecated wrench@1.5.9: wrench.js is deprecated! You should check out fs-extra (https://github.com/jprichardson/node-fs-extra) for any operations you were using wrench for. Thanks for all the usage over the years.
npm ERR! npm WARN deprecated hawk@1.1.1: This module moved to @hapi/hawk. Please make sure to switch over as this distribution is no longer supported and may contain bugs and critical security issues.
npm ERR! npm WARN deprecated jade@0.26.3: Jade has been renamed to pug, please install the latest version of pug instead of jade
npm ERR! npm WARN deprecated istanbul@0.2.16: This module is no longer maintained, try this instead:
npm ERR! npm WARN deprecated   npm i nyc
npm ERR! npm WARN deprecated Visit https://istanbul.js.org/integrations for other alternatives.
npm ERR! npm WARN deprecated highlight.js@7.5.0: Version no longer supported. Upgrade to @latest
npm ERR! npm WARN deprecated istanbul@0.4.5: This module is no longer maintained, try this instead:
npm ERR! npm WARN deprecated   npm i nyc
npm ERR! npm WARN deprecated Visit https://istanbul.js.org/integrations for other alternatives.
npm ERR! npm WARN deprecated buffer@2.1.13: This version of 'buffer' is out-of-date. You must update to v2.8.3 or newer
npm ERR! npm WARN deprecated core-js@0.6.1: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
npm ERR! npm WARN deprecated connect@2.12.0: connect 2.x series is deprecated
npm ERR! fs.js:27
npm ERR! const { Math, Object } = primordials;
npm ERR!                          ^
npm ERR! 
npm ERR! ReferenceError: primordials is not defined
npm ERR!     at fs.js:27:26
npm ERR!     at req_ (/Users/k/.npm/_cacache/tmp/git-clone-c2a6067a/node_modules/natives/index.js:143:24)
npm ERR!     at Object.req [as require] (/Users/k/.npm/_cacache/tmp/git-clone-c2a6067a/node_modules/natives/index.js:55:10)
npm ERR!     at Object.<anonymous> (/Users/k/.npm/_cacache/tmp/git-clone-c2a6067a/node_modules/vinyl-fs/node_modules/graceful-fs/fs.js:1:37)
npm ERR!     at Module._compile (internal/modules/cjs/loader.js:959:30)
npm ERR!     at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)
npm ERR!     at Module.load (internal/modules/cjs/loader.js:815:32)
npm ERR!     at Function.Module._load (internal/modules/cjs/loader.js:727:14)
npm ERR!     at Module.require (internal/modules/cjs/loader.js:852:19)
npm ERR!     at require (internal/modules/cjs/helpers.js:74:18)
npm ERR! npm ERR! code 1
npm ERR! npm ERR! path /Users/k/.npm/_cacache/tmp/git-clone-c2a6067a
npm ERR! npm ERR! command failed
npm ERR! npm ERR! command sh -c gulp
npm ERR! 
npm ERR! npm ERR! A complete log of this run can be found in:
npm ERR! npm ERR!     /Users/k/.npm/_logs/2021-04-17T14_26_53_167Z-debug.log

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/k/.npm/_logs/2021-04-17T14_26_57_629Z-debug.log