There's no way to access older versions of the eBay app unless they're already on your device.
If you're unable to update the app, it could be you're working on an outdated device which no longer supports current versions of the eBay app. If that's the case you'll have to access eBay through a browser on your phone/tablet.
You might run into some tech issues even using the website if your device is unsupported. Same will happen for other sites and apps, not just eBay.
Unfortunately tech ages pretty quickly and once a device is no longer supported, it's upgrade or lose function.
