I am able to download the app, but not install it - my device says "File can't be opened". What should I do?
The Downloads-tab of most phone internet browsers isn't able to install applications. Try opening the file in another application for viewing files instead (File manager / File explorer or similar - it usually has an icon that looks like a folder) and install it from there. Let us know if the problem persists in the pinned thread at the Helpdesk.