Unity unable to list target platforms

1) just open https://androidsdkoffline.blogspot.com/p/android-sdk-tools.html

2) scrolldown to the bottom of that page

3) find Windows "tools_r25.2.3-windows.zip"
download and unzip it

4) remove and replace your folder "SDK" + "/tools"

5) Enjoy!

6) By "SDK Manager" do upgrade to 25.2.5

7) Now works all: Eclipse, Android Studio, Unity.
Enjoy again!