Update README.md

Update to mention that we need paid account. Ivan , thanks for doing this wiki. Tried to install an IPA following your wiki. Got the error mentioned in the update and also noticed that on cydia impactor site it mentions that we need paid acount.
ivRodriguezCA · Jul 16, 2021 · 2345f80 · 2345f80
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diff --git a/Module-4/README.md b/Module-4/README.md
@@ -13,7 +13,7 @@ The exercises in this module are going to be different from the previous module.
 To do the exercises in this module you'll need to first install the `CoinZa` application on your device. Luckily is super simple.
 - If you haven't already, sign up for an `Apple Developer Account` [here](https://developer.apple.com/) (click on the `Account` tab), it's free.
 - Connect your device to your computer.
-- Open `Cydia Impactor` and drag-n-drop the `CoinZa.ipa`. **Important** it has to be the original `.ipa` you downloaded [here](https://github.com/ivRodriguezCA/RE-iOS-Apps-Extras-Github/tree/master/Files) and not the binary you extracted.
+- Open `Cydia Impactor` and drag-n-drop the `CoinZa.ipa`. **Important** it has to be the original `.ipa` you downloaded [here](https://github.com/ivRodriguezCA/RE-iOS-Apps-Extras-Github/tree/master/Files) and not the binary you extracted. (Cydia Impactor needs paid developer account($99), free account doesn't work).
 - Enter your developer username and password and wait for `Impactor` to load install the application on your device.
 - Troubleshooting:
     - If `Impactor` says your password is incorrect (_and you're 100% sure it's not_) or something about an "app-specific password". It probably means you need to generate an app-specific password, here's a [tutorial on how to do it](https://www.imore.com/how-generate-app-specific-passwords-iphone-ipad-mac).
@@ -27,6 +27,8 @@ To do the exercises in this module you'll need to first install the `CoinZa` app
         - Scroll down and select `Profiles & Device Management`.
         - In the `Developer App` section, select your developer account.
         - Tap `Trust` and confirm.
+    - file installer.cpp line 71 what _assert( teams.empty()), means need paid account, free account doesn't work.
+
 
 ##### URL Scheme injection
 As you discovered in the static analysis step, the `CoinZa` application uses custom `Scheme URLs` and if you use what you learned in [Module 3](../Module-3/README.md) and open the application binary in `Hopper` (or `Ghidra`), search for the `AppDelegate` class, select the `application:openURL:options:` method and open it in the `pseudo-code` mode you can find: