Installation of Bootstrap 5 along with Bootstrap 3

In Advanced Template I need to have Bootstrap 3 for backend and Bootstrap 5 for frontend.
How to correctly install and configure to make it work?

When installing BS5 I get an error:

  Problem 1
    - Root composer.json requires yiisoft/yii2-bootstrap dev-master -> satisfiable by yiisoft/yii2-bootstrap[dev-master].
    - yiisoft/yii2-bootstrap5[dev-master, 2.0.1, ..., 2.0.x-dev] require bower-asset/bootstrap ^5.1.0 -> satisfiable by bower-asset/bootstrap[v5.1.0, ..., v5.2.0-beta1].
    - Conclusion: don't install bower-asset/bootstrap v5.2.0-beta1 (conflict analysis result)
    - yiisoft/yii2-bootstrap5 2.0.x-dev is an alias of yiisoft/yii2-bootstrap5 dev-master and thus requires it to be installed too.
    - Root composer.json requires yiisoft/yii2-bootstrap5 * -> satisfiable by yiisoft/yii2-bootstrap5[dev-master, 2.0.1, 2.0.2, 2.0.3, 2.0.x-dev (alias of dev-master)].

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