Utility
From Accelerator for SageCRM
From version 4.3.0.0 the utility is shipped with the outlook client
18 Jan 2019
If the Outlook add-on is disabled you can now quickly fix this using a new utility that fixes the registry settings for Outlook.
Download the tool to the client pc with the issue.
https://www.dropbox.com/s/b1xl263tmn608vx/RepairRegistry.exe?dl=0
Run the application
and click the bug "Repair" button
Restart outlook and the Accelerator add-on should be visible again.