Android SDK manager fails with this message:
Downloading SDK Platform Android 8.1.0, API 27, revision 1 Download finished with wrong size. Expected
Leo Li's instructions worked for me, too. Thanks for the info!
When download fails, you can notice a temp folder for this path:
"C:\Program Files (x86)\Android\android-sdk\temp". There should be a file called platform-27_r01.zip. Copy it out and extract the android-8.1.0 folder.
The next step, rename it to android-27. Then, copy it to the path.
"C:\Program Files (x86)\Android\android-sdk\platforms"