It's worth keeping your Showcase Workshop app up-to-date if you can. We're always developing the app to give you the best experience we can! Updating makes sure you have access to the latest features and bugfixes, you wouldn't want to miss out on those.
The latest version of Showcase can be seen on the store for your device, (usually under the app icon thumbnail, under 'What's New', or 'Version notes'):
(Note that Showcase XE & Showcase for Mac should update automatically.)
If you're installing the app for the first time, head over to How to get up and running on your device for more details.
If you suspect your app might be out of date, check that the version number in the app store matches the version in the Showcase app (under the settings cog).
If the version numbers are not the same, use the App Store app on your device to update the Showcase app and you'll be good to go.