diff --git a/MasKit/AppStore/Downloader.swift b/MasKit/AppStore/Downloader.swift
index c858b0e..1d8ae02 100644
--- a/MasKit/AppStore/Downloader.swift
+++ b/MasKit/AppStore/Downloader.swift
@@ -12,15 +12,17 @@ import StoreFoundation
 /// Monitors app download progress.
 ///
 /// - Parameter adamId: An app ID?
+/// - Parameter purchase: Flag indicating whether the app needs to be purchased.
+/// Only works for free apps. Defaults to false.
 /// - Returns: An error, if one occurred.
-func download(_ adamId: UInt64, isPurchase: Bool) -> MASError? {
+func download(_ adamId: UInt64, purchase: Bool = false) -> MASError? {
     guard let account = ISStoreAccount.primaryAccount else {
         return .notSignedIn
     }
 
     guard let storeAccount = account as? ISStoreAccount
     else { fatalError("Unable to cast StoreAccount to ISStoreAccount") }
-    let purchase = SSPurchase(adamId: adamId, account: storeAccount, isPurchase: isPurchase)
+    let purchase = SSPurchase(adamId: adamId, account: storeAccount, purchase: purchase)
 
     var purchaseError: MASError?
     var observerIdentifier: CKDownloadQueueObserver?
diff --git a/MasKit/AppStore/SSPurchase.swift b/MasKit/AppStore/SSPurchase.swift
index d4fdcf0..11934b4 100644
--- a/MasKit/AppStore/SSPurchase.swift
+++ b/MasKit/AppStore/SSPurchase.swift
@@ -13,7 +13,7 @@ typealias SSPurchaseCompletion =
     (_ purchase: SSPurchase?, _ completed: Bool, _ error: Error?, _ response: SSPurchaseResponse?) -> Void
 
 extension SSPurchase {
-    convenience init(adamId: UInt64, account: ISStoreAccount, isPurchase: Bool) {
+    convenience init(adamId: UInt64, account: ISStoreAccount, purchase: Bool = false) {
         self.init()
 
 		var parameters: [String: Any] = [
@@ -24,7 +24,7 @@ extension SSPurchase {
 			"appExtVrsId": 0
 		]
 
-        if isPurchase {
+        if purchase {
 			parameters["macappinstalledconfirmed"] = 1
 			parameters["pricingParameters"] = "STDQ"
 
@@ -42,7 +42,7 @@ extension SSPurchase {
         appleID = account.identifier
 
         // Not sure if this is needed, but lets use it here.
-        if isPurchase {
+        if purchase {
             isRedownload = false
         }
 
diff --git a/MasKit/Commands/Install.swift b/MasKit/Commands/Install.swift
index 9316db4..f16db8b 100644
--- a/MasKit/Commands/Install.swift
+++ b/MasKit/Commands/Install.swift
@@ -37,7 +37,7 @@ public struct InstallCommand: CommandProtocol {
                 return nil
             }
 
-            return download(appId, isPurchase: false)
+            return download(appId)
         }
 
         switch downloadResults.count {
diff --git a/MasKit/Commands/Lucky.swift b/MasKit/Commands/Lucky.swift
index 46dea83..4d5d84f 100644
--- a/MasKit/Commands/Lucky.swift
+++ b/MasKit/Commands/Lucky.swift
@@ -73,7 +73,7 @@ public struct LuckyCommand: CommandProtocol {
                 return nil
             }
 
-            return download(appId, isPurchase: false)
+            return download(appId)
         }
 
         switch downloadResults.count {
diff --git a/MasKit/Commands/Purchase.swift b/MasKit/Commands/Purchase.swift
index 46dcce0..82c5990 100644
--- a/MasKit/Commands/Purchase.swift
+++ b/MasKit/Commands/Purchase.swift
@@ -36,7 +36,7 @@ public struct PurchaseCommand: CommandProtocol {
 				return nil
 			}
 
-			return download(appId, isPurchase: true)
+			return download(appId, purchase: true)
 		}
 
 		switch downloadResults.count {
diff --git a/MasKit/Commands/Upgrade.swift b/MasKit/Commands/Upgrade.swift
index 589a78f..035999d 100644
--- a/MasKit/Commands/Upgrade.swift
+++ b/MasKit/Commands/Upgrade.swift
@@ -71,7 +71,7 @@ public struct UpgradeCommand: CommandProtocol {
         print(updates.map({ "\($0.title) (\($0.bundleVersion))" }).joined(separator: ", "))
 
         let updateResults = updates.compactMap {
-            download($0.itemIdentifier.uint64Value, isPurchase: false)
+            download($0.itemIdentifier.uint64Value)
         }
 
         switch updateResults.count {