server/apps/files_versions/appinfo/update.php

<?php

$installedVersion=OCP\Config::getAppValue('files_versions', 'installed_version');
// move versions to new directory
if (version_compare($installedVersion, '1.0.2', '<')) {
	$users = \OCP\User::getUsers();
	$datadir =  \OCP\Config::getSystemValue('datadirectory').'/';
    foreach ($users as $user) {
    	$oldPath = $datadir.$user.'/versions';
    	$newPath = $datadir.$user.'/files_versions';
    	if(is_dir($oldPath)) {
    		rename($oldPath, $newPath);
    	}
    }

}