From Adobe
Lightroom CC 2015.2.1 and Lightroom 6.2.1 are now available through the Help-> Check for Updates menu item inside Lightroom.
This update provides a performance fix related to Import and also fixes crashing bugs identifying in the Lightroom CC 2015.2 / Lightroom 6.2 release.
Installation Instructions
Please select Help > Updates to use the update mechanism in the Creative Cloud app.