It depends on your device model and the latest OS version that manufacture allows you to update.
If it is below iOS 10 or Android 5.0, unfortunately, I don't think there is a way to use Spacio app on your device. Both Apple and Android change their memory requirement and system architecture in their updates so the older devices won't be able to update. As Spacio we definitely want to support as many devices as possible but the older devices and OS versions no longer have the capability to support the plugins and features that we require for the app.
Alternatively, you can use still Spacio on your device, but instead of downloading the app, you can use the web browser (our preferred browser is Chrome) on your device to go to spac.io/dashboard and log in and use Spacio as you would use it on your desktop. Just a note, you will need internet or wifi access all time when you use Spacio from the browser.
We also have a more detailed device page with some recommendations on devices: