… strange? Your friend running any anti-virus-software? For example : Kaspersky. Check if the software is adding the dll to their quarantine?
… you don’t need to re-install the whole application. Mount the Cubase 10 iso, zip … and locate the Transit installer
/Volumes/Cubase 10/Additional Content/Installer/VST_Transit_64bit.msi
It works?
Michael.