I noticed that this AddOn is using 'LibClassicHealComm-1.0' (https://github.com/Aviana/HealComm, now 404), which has been deprecated in favour of the resurrection of the original library from 2010, 'LibHealComm-4.0'. The updated version is available at https://www.wowace.com/projects/libhealcomm-4-0.
I am not sure of the implementation effort required to support this change, but I note that the two version are incompatible and therefore kindly urge to update at the earliest convenience to ensure interoperability between all the popular unit frames and healing AddOns. ElvUI and Grid2 has already migrated and VuhDo is shipping this week.
Thank you for your work.