This is a regression.
Steps to reproduce:
1. Remove 2.1.3 SDK from the Titanium SDK folder;
2. Run Help > Check for Titanium Updates;
3. If there are other updates (CLI/Alloy/ACS) shown in the dialog, uncheck them to leave only Titanium SDK checked;
4. Click Install.
Expected result: Studio should install SDK without prompting for password.
Actual result: the Authentication dialog appear for password.