What's new in Acorn:
Acorn 1.5.4 release notes: Acorn 1.5.3 release notes: Acorn 1.5.2 release notes: Acorn 1.5.1 release notes:

Acorn 1.5 release notes:

New Features: Changes / Additions: Bug Fixes:
Version 1.2.1 Version 1.2 Version 1.1.1 Version 1.1b2 Version 1.1b1 Version 1.0.3 Version 1.0.2 Version 1.0.1