Não precisei desinstalar nada, apenas segue o vídeo
Resolvido com o vídeo https://www.youtube.com/watch?v=unhulzNJk9M
E:\alura\flutter\src\flutter>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.12.13+hotfix.9, on Microsoft Windows [versão 10.0.18362.418], locale pt-BR)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[√] Android Studio (version 3.6)
[√] Connected device (1 available)
• No issues found!