Why can't I upgrade SBA (Small Business Advantage) from 3.X version to 4.X version directly on the new platform 100 series?

With the launching of new platform 100 series, Intel also does some update based on SBA (Small Business Advantage).

The version of SBA on 9 series MB stops at 3.X, and for 100 series not only 3.X version can be supported, but the version can upgrade to 4.0+.

The important thing is users can't upgrade 3.X to 4.0+ directly, they need to uninstall 3.X version before they install 4.0+ version.

But if users' SBA version is 4.0+, they can upgrade to the above version directly.