I have a similar error with Xcode build 16C5032a. Download fails for iOS Simulator 18.0/18.1/18.2/18.3.1, while it is successful for 17.x Download failed. Domain: DVTDownloadableErrorDomain Code: 41 User Info: { DVTErrorCreationDateKey = "2025-02-26 09:58:16 +0000"; } -- Download failed. Domain: DVTDownloadableErrorDomain Code: 41 -- Failed fetching catalog for assetType (com.apple.MobileAsset.iOSSimulatorRuntime), serverParameters ({ RequestedBuild = 22D8075; }) Domain: DVTDownloadsUtilitiesErrorDomain Code: -1 -- Download failed due to a bad URL. (Catalog download for com.apple.MobileAsset.iOSSimulatorRuntime) Domain: com.apple.MobileAssetError.Download Code: 49 User Info: { checkConfiguration = 1; } -- System Information macOS Version 15.3.1 (Build 24D70) Xcode 16.2 (23507) (Build 16C5032a) Timestamp: 2025-02-26T13:58:16+04:00

I found out there was a bunch of apple hosts in /etc/hosts listed as 0.0.0.0 It looks like it happened after my Mac was removed from Apple Business Manager and wiped. I removed those lines from /etc/hosts and download works fine after that.