Update: got it to install by booting the Libraryy Installer app and manually installing it rather than the auto-install that wasn't working in the Download Manager.

Thats good, I can install it now, too.

Good idea ....

ok, thanks .....

All on my Mac is up to date ....... latest Version of OSX, lates eLicenser-Version, latest Vienna Download Manager-Version .......... 

Have VSL a support ? Where I can get support ? 

Installing the VSL Sync Library update "Cantabile Games," does not allow installation. The following error message is displayed; "Application 'Library Installer' caused the following error:

The program 'Synsopos.app' could not be started. The file is probably corrupt or incompatible, or the file permissions are incorrect.

Please download and install the latest version of the 'eLicenser Control' from this web page:

<Http://www.eLicenser.net>

options:

- Click <Ok> to finish. "

How can this be corrected .....?