Hi @MiralayMirim ,
I hope you’ve already got it sorted
I can’t send you the .uasset file directly, but you can try the following:
Open the Epic Games Launcher and go to Library. On the Unreal Engine 5.4.3 entry, open the three-dots menu and choose Verify. This option repairs or re-downloads any damaged or missing files, including BP_Sky_Sphere if it’s part of your installation.
You can also create a clean project in 5.4.3. In the Content Browser, search for BP_Sky_Sphere, right-click it, and choose Asset Actions - Migrate ,or Copy Reference/Copy to bring it into your current project.
Hope that helps!