NPM dependecies

[dpsa-dev]

I'm very new to node js, I've downloaded the project, do I need to install the packages /dependencies somehow? and do I need a specific version of npm? I've tried

npm install --force
npm run start
npm i --save-dev @types/node

npm install --force
npm WARN using --force Recommended protections disabled.
npm WARN ERESOLVE overriding peer dependency
npm WARN While resolving: [email protected]
npm WARN Found: [email protected]
npm WARN node_modules/rollup
npm WARN dev rollup@"^4.4.0" from the root project
npm WARN 12 more (@rollup/plugin-commonjs, @rollup/plugin-image, ...)
npm WARN
npm WARN Could not resolve dependency:
npm WARN peer rollup@"^2.0.0" from [email protected]
npm WARN node_modules/rollup-plugin-terser
npm WARN dev rollup-plugin-terser@"^7.0.2" from the root project
npm WARN
npm WARN Conflicting peer dependency: [email protected]
npm WARN node_modules/rollup
npm WARN peer rollup@"^2.0.0" from [email protected]
npm WARN node_modules/rollup-plugin-terser
npm WARN dev rollup-plugin-terser@"^7.0.2" from the root project

one of the first errors:
.ts:301:17 - error TS2591: Cannot find name 'Buffer'. Do you need to install type definitions for node? Try npm i --save-dev @types/node and then add 'node' to the types field in your tsconfig.

some of the latest errors:

[email protected] start
npm run build && lite-server -c ls-config.json

[email protected] build
npm run buildts && npm run buildru && npm run copypdfjsworker

[email protected] buildts
tsc && npm run copypngtotsc

src/document/entities/annotations/annotation-dict.ts:1144:5 - error TS2322: Type 'Timeout' is not assignable to type 'number'.

1144 this._transformationTimer = setTimeout(() => {
~~~~~~~~~~~~~~~~~~~~~~~~~