To prevent issues during the patching process it is best to restart your PC beforehand.
Otherwise you might run into issues which arise the need for this other guide of mine.
https://steamproxy.net/sharedfiles/filedetails/?id=3026209399
If you like to learn more about patching process you can check the explaining post here

The patching process | Patch deletes the game explained
https://steamproxy.net/app/1086940/discussions/3/3958162152960089964/
(applicable for patch#4 and above)

In more than 93% of all cases everything goes well. The last < 7% might have issues with the download. To be on the safe side, remember to verify your game files after downloading the update.

Yes, the game does that verification automatically. But sometimes the automatic functions do not trigger a new download despite it is needed. I have experienced that myself in the past when updating games. I have noticed that the verification failed, and it attempted a re-download, but it did not. Only after I triggered the verification manually Steam did a re-download of one essential file. Otherwise my game would not have started properly.

That is why I recommend you to do it manually after you finished updating your game.

Right-click on the game in your Steam Library -> select Properties



Go to the Local Files tab and select Verify integrity of game files




You might be surprised how important that little detail might be. That simple action already solves so many problems, it is hilarious that it gets overlooked more often than you can imagine.

The thing is: services can get stuck over time.
When services of your operating system get stuck, they might become unable to load essential things like drivers how they normally do. Even if they worked flawless half an hour ago. An update is still a change on your PC to a certain degree which can trigger a service getting stuck randomly.

It is basically like paper jam with your printer.
You can have it go well forever and ever, and sometimes it just happens.
And the longer you go without a manual restart, the more likely it can happen.
A regular shutdown and turning on again will not do nowadays (because of Windows "feature").

Then you level it up by triggering a Steam Library Repair

Open Steam Settings from the main menu of Steam



Go to the Storage tab, select the drive on which your game is installed, then pick the Repair Folder option from the menu (the three dots "...")

Make sure to restart your PC before you continue, as we will also address the OS's TEMP folder



===================================================

Go to


and delete the whole content of that folder.

For your convenience, you can copy & paste the link above into the address bar of your Windows Explorer, as shown in this screenshot:




Go to


and delete the Launcher folder.




Go to


and delete there everything except PlayerProfiles folder




Go to


and delete there all files except for the folders.




Go to


and delete there everything except for the Savegames folder




Go to


and delete there everything what can be deleted




Next we trigger the Launcher's Crash Reporter to help the launcher from being stuck.

Right-click on the game's entry in your Steam Library -> Manage -> Browse local files



Go into the Launcher folder



Start CrashReporter.exe via double-click or ENTER





You do not need to enter and send any information. You can already close that window again. All we wanted is just to trigger it, in order to unstuck the Launcher from anything which might have disabled it from working properly.

If you have any other issues with the Launcher, use this
https://steamproxy.net/sharedfiles/filedetails/?id=3022256045
Better would be if you do not use the Launcher at all
https://steamproxy.net/sharedfiles/filedetails/?id=3015166965
If you still experience issues after this delete shader cache and reset the game as described here
https://steamproxy.net/sharedfiles/filedetails/?id=3018203217

https://steamproxy.net/sharedfiles/filedetails/?id=3023989629
https://steamproxy.net/sharedfiles/filedetails/?id=3024252010
https://steamproxy.net/sharedfiles/filedetails/?id=3027526886

In case you need official support you can reach out to Larian Support using these

via email support@larian.com

via online form https://larian.com/support/baldur-s-gate-3#modal

their website https://larian.com/support/baldur-s-gate-3

If you found a bug you can also use the online form to submit your findings as described here
https://steamproxy.net/sharedfiles/filedetails/?id=3028112456