TYPO3 Core

EM always suggests to update to the latest version of an extension although it could lead to conflicts.

When you install ks_sitemgr, you have this in the dependencies:

'constraints' => array(
    'depends' => array(
        'be_acl' => '1.3.0-1.3.99',
    ),
    'conflicts' => array(
        'be_acl' => '1.4.0',
    ),
    'suggests' => array(),
),

Once you install version 1.3.3 of be_acl, then install ks_sitemgr, it still suggest to upgrade to the latest version (currently 1.4.3) instead of sticking to the 1.3 branch.