Some days ago I upgraded PD 15 on my MBP mid 2012, High Sierra (10.13.6) to 16. The upgrade process failed. To check the issue, I didn't have time. What I didn't realized because of business time constraints: PD didn't work at all anymore! Some days later I realized that my encrypted folders and files were not accessible anymore: Boxcryptor failed to work. At this moment I didn't remember, that the upgrade of PD failed. And I never could imagine, that the upgrade failure of PD 16 could crash other Apps! I contacted the support of Boxcryptor Inc. and created a lot of log-files. In the meantime I wanted to run my PD VM with Win 10. But I couldn't start Win 10. Then I remembered the failure of upgrading PD 15 to 16. Nothing worked. Restart, de-installation and re-instalation, nothing helped. I contacted the support of Parallels via phone. A support agent in Asia took over the control of my MBP via LogMeIn. He couldn't solve the problem. I had to de-install PD 15/16 and then undertake a full recovery process of MacOS! After the recovery process Boxcryptor was running again smoothly without any other measurement! Then I tried to install PD 16 again. FAILED! And - much more - CRASHED my MacOS again!!! Boxcryptor stopped to run. Again: De-Installation of PD 16. Recovery of MacOs. Boxcryptor worked fine again without any other measurement. Installation (downgrade) of PD to 15 instead of 16. PD 15 is running as expected. Back to support by Parallels Inc.: I told them my experience, that PD 16 is 'Banana-Software' ('not mature', needs to get mature at customer premises...). Believe me or not: The agent asked me to upgrade to PD 16 again, create log files and reports and send them to him. He wanted to excalate the issue to the engineers. FORGET IT!