Fix release build

Author: insidegui

VirtualCore/Source/Definitions/PreviewSupport.swift

@@ -136,11 +136,4 @@ public extension ResolvedRestoreImage {
     static let previewMac = ResolvedCatalog.previewMac.groups[0].restoreImages[0]
     static let previewLinux = ResolvedCatalog.previewLinux.groups[0].restoreImages[0]
 }
-
-#else
-public extension ProcessInfo {
-
-    @objc static let isSwiftUIPreview: Bool = false
-
-}
 #endif

VirtualUI/Source/Installer/VMInstallationViewModel.swift

@@ -292,7 +292,7 @@ final class VMInstallationViewModel: ObservableObject, @unchecked Sendable {
             Backend = URLSessionDownloadBackend.self
         }
         #else
-        Installer = URLSessionDownloadBackend.self
+        Backend = URLSessionDownloadBackend.self
         #endif
 
         return Backend.init(library: library, cookie: cookie)
@@ -478,7 +478,7 @@ final class VMInstallationViewModel: ObservableObject, @unchecked Sendable {
             Backend = VirtualizationRestoreBackend.self
         }
         #else
-        Installer = VirtualizationRestoreBackend.self
+        Backend = VirtualizationRestoreBackend.self
         #endif
 
         return Backend.init(model: model, restoringFromImageAt: restoreURL)