Looks like the latest version in not in npm - v0.0.11

[madmacc]

npm i @angular/animations@0.0.11 --force
npm WARN using --force Recommended protections disabled.
npm ERR! code ETARGET
npm ERR! notarget No matching version found for @angular/animations@0.0.11.
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.

[abney317]

It's 0.11.0 not 0.0.11

[filipows]

If you want the one that supports angular 15 it's:
npm i angular-animations@beta or npm i angular-animations@0.15.0-beta.0

[madmacc]

Ah my mistake. Its weird as the previous version shows up in the package.json as 0.0.10

[madmacc]

I am running Angular 10 but just after the horizontal collapse animation

Ah I see I should have used angular-animations not @angular/animations and also 0.11.0 not 0.0.11.
That worked.