Microsoft Excel may disable Add-ins automatically if errors occur or if they take too long to finish their operations. However, you can re-enable the Add-ins without needing to restart your operating system. For this, follow the steps below:
Open Microsoft Excel and go to File -> Options
-> Add-ins -> Manage: COM Add-ins -> Go…
Select checkbox
Devart Excel Add-ins -> OK:
(If it was already
selected, turn it OFF, then ON)
The Devart tab in
the Excel menu ribbon should appear again.