Help running a vue.js program created in older version

npm warn old lockfile
npm warn old lockfile The package-lock.json file was created with an old version of npm,
npm warn old lockfile so supplemental metadata must be fetched from the registry.
npm warn old lockfile
npm warn old lockfile This is a one-time fix-up, please be patient...
npm warn old lockfile
npm warn old lockfile Could not fetch metadata for vue-loader-v16@16.0.0-rc.2 vue-loader-v16: No matching version found for vue-loader-v16@16.0.0-rc.2.
npm warn old lockfile     at module.exports (/usr/local/lib/node_modules/npm/node_modules/npm-pick-manifest/lib/index.js:215:23)
npm warn old lockfile     at RegistryFetcher.manifest (/usr/local/lib/node_modules/npm/node_modules/pacote/lib/registry.js:130:54)
npm warn old lockfile     at async /usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:715:24 {
npm warn old lockfile   code: 'ETARGET',
npm warn old lockfile   type: 'version',
npm warn old lockfile   wanted: '16.0.0-rc.2',
npm warn old lockfile   versions: [
npm warn old lockfile     '16.0.0-beta.5',
npm warn old lockfile     '16.0.0-beta.5.1',
npm warn old lockfile     '16.0.0-beta.5.2',
npm warn old lockfile     '16.0.0-beta.5.3',
npm warn old lockfile     '16.0.0-beta.5.4'
npm warn old lockfile   ],
npm warn old lockfile   distTags: { latest: '16.0.0-beta.5.4' },
npm warn old lockfile   defaultTag: 'latest'
npm warn old lockfile }
npm error code ERESOLVE
npm error ERESOLVE unable to resolve dependency tree
npm error
npm error While resolving: calendar_app@0.1.0
npm error Found: eslint@6.8.0
npm error node_modules/eslint
npm error   dev eslint@"^6.7.2" from the root project
npm error
npm error Could not resolve dependency:
npm error peer eslint@">=7.5.0" from @vue/cli-plugin-eslint@5.0.8
npm error node_modules/@vue/cli-plugin-eslint
npm error   dev @vue/cli-plugin-eslint@"~5.0.0" from the root project
npm error
npm error Fix the upstream dependency conflict, or retry
npm error this command with --force or --legacy-peer-deps
npm error to accept an incorrect (and potentially broken) dependency resolution.