ISSUEAfter Parallels Desktop upgrade you can see the following message at the first start of your Windows virtual machine:
CAUSEEvery Parallels Desktop update requires Parallels Tool to be updated from an old version to a new one.
RESOLUTIONPlease wait until the installation completes, do not stop or suspend the virtual machine. It is not recommended to start any Windows applications during the Parallels Tool update.
The duration of Parallels Tools update depends on your environment and may take several minutes.