Angular downgrading problem from 12 to v8?

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angular-cli

Angular8

Angular11

i tried to setup angular project with angular 8 but unfortunetly I installed v 12 and I figured it at the end of the project so I tried to downgrade so that is what happened after trying

dependencies": {
"@angular/animations": "~12.2.8",
"@angular/common": "~12.2.8",
"@angular/compiler": "~12.2.8",
"@angular/core": "~12.2.8",
"@angular/forms": "~12.2.8",
"@angular/platform-browser": "~12.2.8",
"@angular/platform-browser-dynamic": "~12.2.8",
"@angular/router": "~12.2.8",
"@okta/okta-angular": "^3.2.2",
"@okta/okta-signin-widget": "^5.10.1",
"core-js": "^2.5.4",
"rxjs": "~7.3.1",
"tslib": "^1.9.0",
"zone.js": "~0.11.4}

but at the console:

Angular CLI: 8.3.29 Node: 16.4.1 OS: win32 x64 Angular: undefined ...

Package Version

------------------------------------------------------

@angular-devkit/architect    0.803.29 (cli-only)
@angular-devkit/core         8.3.29 (cli-only)
@angular-devkit/schematics   8.3.29 (cli-only)
@schematics/angular          8.3.29 (cli-only)
@schematics/update           0.803.29 (cli-only)

so what should I do?? and if I want to make anew project to avoid this error ..can I copy the Component and Service folder directly to the new one because I cannot start the project from the beginning??

What I have tried:

stackoverflow similar answers to my questions