Follow these steps to install Spaces app on your Android phone directly (without Play store or any other app store):
Step 1 - On your Phone's browser, visit intouchapp.com/apps/spaces and click on Download from our site.
Step 2 - Open the downloaded file
Step 3- When installing the file, enable the permissions to allow the install by accepting Allow from this source.
Step 4 - The app would be installed on your mobile device and you can start using the app.