Persistent -100 update error

I am trying to use BD Antivirus on a 13 inch MBP - mid 2010. The OS is High Sierra. The app seems to install properly but I cannot update the signatures. If I manually update it starts and downloads for about 5 seconds, then stops and gives the -100 error. I have re-installed BD Antivirus and that does not solve the problem. One thing I did notice is that during the re-installation, I did not encounter the extra steps required for installation with High Sierra. Checking the Security & Privacy settings showed that BD was not blocked from loading.

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