Install a Preview Version of Android Studio

If you are trying to install preview version and you do not have any Android Studio version in your machine then you can also follow below steps to install it. Just keep in mind that avoid purple highlighted option from below steps. 

After you download an Android Studio preview, simply save the application alongside any other version of Android Studio as described below.

Windows:

1. Unpack the ZIP file.
2. Rename the resulting folder to something unique like “Android Studio Preview.”. You do not have any Android Studio version in your machine then you can avoid this step.
3. Move it to a permanent location, such as next to your existing Android Studio install in C:\Program Files\Android\.
4. Inside C:\Program Files\Android\Android Studio Preview\bin\, launch exe(or if you’re on a 32-bit machine, launch studio.exe).
5. To make the preview version available in your Start menu, right-click exeand click Pin to Start Menu.

Mac:

1. Unpack the ZIP file.

Note: If you download version 2.3 or lower, the application name does not include the version number, so you must first rename it before moving the the new version into your apps directory. Otherwise, you might override your existing version of Android Studio. You do not have any Android Studio version in your machine then you can avoid this step.

2. Drag the app file into your Applications
3. Now launch it.

Linux:

1. Unpack the ZIP file.
2. Rename the resulting folder to something unique like “android-studio-preview.”. You do not have any Android Studio version in your machine then you can avoid this step.
3. Move it to wherever you have your stable version, such as within /usr/local/for your user profile, or /opt/ for shared users.
4. Open a terminal, navigate into android-studio-preview/bin/and execute sh.
5. To make the preview version available in your list of applications, select Tools > Create Desktop Entryfrom the Android Studio menu bar.

Change your update channel

By default, each Android Studio installation receives updates corresponding to the channel you originally downloaded (Canary, Beta, or Stable). If you want to change the update channel for a given install, follow these steps:

1. In Android Studio, select File > Settings(or Android Studio > Preference on Mac).
2. In the left pane, select Appearance & Behavior > System Settings > Updates.
3. Be sure that Automatically check for updatesis checked, and then select a channel from the drop-down list.
4. Click OK.

When a new version of Android Studio is available for your channel, you’ll receive a bubble notification in the IDE. If you chose to ignore it at first, you can check for updates later by clicking Help > Check for Update (for MAC  Android Studio > Check for Updates  or Android Studio -> Preferences -> In search bar, search for “Channel”).

If you have some doubt then I recommend you to have a look on above video for more better understanding. You can put your question also in the comment section below.