I reinstalled everything from step 1. When running the script from step 4 I got the following message:

Warning: File C:\Users\User\.android\.android\repositories.cfg could not be loaded.

From this point on, all commands show the same warning message, followed by:

[=======================================] 100% Computing updates...

After that, the tns doctor shows no errors, but when i execute npm install from the app terminal I get a bunch of no such file or directory, open 'C:\Users\...\mdb-angular-mobile-free-8.0.0\node_modules\.staging\...

I would say all these errors come from the repositories.cfg error.

In Step 4 you need to copy the command from our guide to the command prompt and press enter to install the dependencies. The %ANDROID_HOME% variable points to the android folder on your machine. If your ANDROID_HOME variable is not set you can replace it with the path to the android-sdk, which should look like this: C:\Android\android-sdk.

Then this command "%ANDROID_HOME%\tools\bin\sdkmanager" will be the same as "C:\Android\android-sdk\tools\bin\sdkmanager"

The same rule applies to the step 5. Open your terminal and go to C:\Android\android-sdk\tools\bin, then use command for sdkmanager and avdmanager as explained in the guide.

Please let us know if you encounter any further problems with the installation.