Unfortunately, Scratch 2.0 requires proprietary software:Scratch has been completely rewritten in Adobe Flash for version 2.0 but still runs projects from older versions of Scratch.
https://wiki.scratch.mit.edu/wiki/Scratch_2.0#Features
Scratch 2.0 is a completely flash-based program, in which both the project editor and project page viewer use the same player, the Flash player.
https://wiki.scratch.mit.edu/wiki/Flash_Player
