It sounds like you're asking about the and whether a "check software download" feature exists or is helpful.
Would you like step-by-step screenshots for your specific phone (iPhone or Android)? viator check software download
Instead, Viator provides offline access to your bookings via their mobile app — which is the helpful feature you may be looking for. Helpful feature: Downloading your Viator booking for offline use Once you download the Viator app (iOS or Android), you can save tour/voucher details to your phone so they work without an internet connection. This is very useful when traveling abroad with limited data. It sounds like you're asking about the and