When you try to update something through Steam like Dota 2 game or wallpaper engine the download section or a separate error may occur which says the download is paused since the content file is locked
you may find different solutions online most of them will tell you to verify local game cache restart steam reinstall drivers and all that kind of stuff move your steam Library folders around and stuff like that you don’t have to do any of that actually the only thing you need to do is just restart your PC go to your Windows start menu and select restart PC from the power menu once your PC reboots most probably this will sort out the problem and the download and update or installation will successfully continue and complete