diff --git a/AltStore/Managing Apps/AppManager.swift b/AltStore/Managing Apps/AppManager.swift
index 00958353..5c4dacc2 100644
--- a/AltStore/Managing Apps/AppManager.swift	
+++ b/AltStore/Managing Apps/AppManager.swift	
@@ -1223,7 +1223,7 @@ private extension AppManager
         let progress = Progress.discreteProgress(totalUnitCount: 100)
         
         let context = AppOperationContext(bundleIdentifier: app.bundleIdentifier, authenticatedContext: group.context)
-        context.app = ALTApplication(fileURL: app.url)
+        context.app = ALTApplication(fileURL: app.fileURL)
         
         /* Fetch Provisioning Profiles */
         let fetchProvisioningProfilesOperation = FetchProvisioningProfilesOperation(context: context)
diff --git a/AltStore/Operations/DownloadAppOperation.swift b/AltStore/Operations/DownloadAppOperation.swift
index ae70ae8f..c386bb35 100644
--- a/AltStore/Operations/DownloadAppOperation.swift
+++ b/AltStore/Operations/DownloadAppOperation.swift
@@ -36,7 +36,7 @@ class DownloadAppOperation: ResultOperation<ALTApplication>
     let context: AppOperationContext
     
     private let bundleIdentifier: String
-    private let sourceURL: URL
+    private var sourceURL: URL?
     private let destinationURL: URL
     
     private let session = URLSession(configuration: .default)
@@ -69,7 +69,9 @@ class DownloadAppOperation: ResultOperation<ALTApplication>
         
         print("Downloading App:", self.bundleIdentifier)
         
-        self.downloadApp(from: self.sourceURL) { result in
+        guard let sourceURL = self.sourceURL else { return self.finish(.failure(OperationError.appNotFound)) }
+        
+        self.downloadApp(from: sourceURL) { result in
             do
             {
                 let application = try result.get()
@@ -165,7 +167,7 @@ private extension DownloadAppOperation
             }
         }
         
-        if self.sourceURL.isFileURL
+        if sourceURL.isFileURL
         {
             finishOperation(.success(sourceURL))
             
diff --git a/AltStore/Operations/SendAppOperation.swift b/AltStore/Operations/SendAppOperation.swift
index 1a46386b..90f6cbee 100644
--- a/AltStore/Operations/SendAppOperation.swift
+++ b/AltStore/Operations/SendAppOperation.swift
@@ -39,7 +39,7 @@ class SendAppOperation: ResultOperation<()>
         guard let resignedApp = self.context.resignedApp else { return self.finish(.failure(OperationError.invalidParameters)) }
         
         // self.context.resignedApp.fileURL points to the app bundle, but we want the .ipa.
-        let app = AnyApp(name: resignedApp.name, bundleIdentifier: self.context.bundleIdentifier, url: resignedApp.url)
+        let app = AnyApp(name: resignedApp.name, bundleIdentifier: self.context.bundleIdentifier, url: resignedApp.fileURL)
         let fileURL = InstalledApp.refreshedIPAURL(for: app)
         
         
diff --git a/AltStoreCore/Protocols/AppProtocol.swift b/AltStoreCore/Protocols/AppProtocol.swift
index 94fa6f99..cd76b785 100644
--- a/AltStoreCore/Protocols/AppProtocol.swift
+++ b/AltStoreCore/Protocols/AppProtocol.swift
@@ -13,16 +13,16 @@ public protocol AppProtocol
 {
     var name: String { get }
     var bundleIdentifier: String { get }
-    var url: URL { get }
+    var url: URL? { get }
 }
 
 public struct AnyApp: AppProtocol
 {
     public var name: String
     public var bundleIdentifier: String
-    public var url: URL
+    public var url: URL?
     
-    public init(name: String, bundleIdentifier: String, url: URL)
+    public init(name: String, bundleIdentifier: String, url: URL?)
     {
         self.name = name
         self.bundleIdentifier = bundleIdentifier
@@ -32,21 +32,21 @@ public struct AnyApp: AppProtocol
 
 extension ALTApplication: AppProtocol
 {
-    public var url: URL {
+    public var url: URL? {
         return self.fileURL
     }
 }
 
 extension StoreApp: AppProtocol
 {
-    public var url: URL {
+    public var url: URL? {
         return self.downloadURL
     }
 }
 
 extension InstalledApp: AppProtocol
 {
-    public var url: URL {
+    public var url: URL? {
         return self.fileURL
     }
 }