Odd tentacle error

Wanted to see if you guys could weigh in on the below HO-OCTOPUS TENTACLE UPGRADE ERROR. We just upgraded to the newest version of Octopus and everything went pretty smooth and we are up and running without issue but we did encounter this below on a tentacle upgrade.

This server does not have version 3.7.71 of the Calamari package. It will be pushed automatically.
June 19th 2017 06:50:20Error
Remove-Item : Cannot remove item D:\Octopus\Calamari\Local\3.7.71\AlphaFS.dll:
June 19th 2017 06:50:20Error
Access to the path ‘AlphaFS.dll’ is denied.
June 19th 2017 06:50:20Error
At D:\Octopus\Work\20170619115013-4508\Bootstrap.ps1:44 char:7
June 19th 2017 06:50:20Error

  •         Remove-Item $_.FullName -Recurse -Force
    

June 19th 2017 06:50:20Error

  •         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    

June 19th 2017 06:50:20Error
+ CategoryInfo : PermissionDenied: (AlphaFS.dll:FileInfo) [Remove
June 19th 2017 06:50:20Error
-Item], UnauthorizedAccessException
June 19th 2017 06:50:20Error
+ FullyQualifiedErrorId : RemoveFileSystemItemUnAuthorizedAccess,Microsoft
June 19th 2017 06:50:20Error
.PowerShell.Commands.RemoveItemCommand
3 additional lines not shown

Hi,

Thanks for getting in touch! There have been cases where virus scanners have deleted or changed permissions on calamari directories and files. It would cause this sort of error.
You can delete everything from the folder: D:\Octopus\Calamari\Local\ and it will install Calamari correctly.
I would suggest that if you do use a virus scanner you white list the D:\Octopus\ directory on your Tentacles.

Let me know how you go!
Vanessa

Thanks