You can have multiple Rails versions installed at the same time.
To install the rails version you need:
<pre><code class="lang-bash">gem install rails --version=5.2.8
</code></pre>
How to specify the rails version to use
<pre><code class="lang-sh">rails _5.2.8_ new old_school_rails
</code></pre>
And inside the project, you will have the correct rails version
<pre><code class="lang-bash">cd old_school_rails
bundle exec rails --version
Rails 5.2.8.1
</code></pre>

You can have multiple Rails versions installed at the same time.

To install the rails version you need:

```bash
gem install rails --version=5.2.8
```

How to specify the rails version to use

```sh
rails _5.2.8_ new old_school_rails
```

And inside the project, you will have the correct rails version

```bash
cd old_school_rails
bundle exec rails --version
Rails 5.2.8.1
```

Managing Multiple Rails Versions in Development