Steam Stuck on Preparing to Launch: Check for the latest Windows updates and install them (if any) on your PC.
Disabling the Windows firewall and clean booting your PC also helps you. In addition to that, editing the host file fix the error.
Steam Stuck on Updating: Select Steam Client and run it with the administrator account to resolve this issue.
Moreover, select any nearly located download server. Check for the corrupted Library files/folders on Steam and repair them. If not, clear the download cache on Steam.
Steam Stuck on Verifying Installation: In this situation, reboot your Windows and check the error is fixed or not.
Apart from that, restarting Steam Client might fix this issue. After that, change the download server and try downloading it again on your system.
Steam Stuck on Unpacking: First of all, uninstall the game from your PC.
Apart from that, there are some other reasons for the occurrence of this Steam Stuck on Preallocating error. In case if there are any issues, such as insufficient storage space, it will not download the game. Moreover, it optimizes the files in order to escape from fragmentation. And it allocates the required space to download those games on our Windows PCs. Steam allows us to search our favorite and best-selling games on its library. We can download the games as well as play them online on our desktop computers and consoles (Xbox, PlayStation, and Switch Nintendo). Valve developed this Steam Client for all game lovers. Steam is the popular digital distribution platform that came into existence in 2003.