I am trying to update from 1.1.1 to the latest edition 1.4.4 with the power shell script I get the following error

****************************************
* *
* Welcome to the SolidCP *
* Automated Upgrader *
* *
* Please be patient whilst *
* the menu is loaded *
* *
****************************************
Test-Path : Cannot bind argument to parameter 'Path' because it is an empty string.
At C:MSPControlEnterprise ServerSolidCP-Auto-Upgrade.ps1:1170 char:16
+ if (Test-Path "$SCP_EntSvr_Dir") { # Check to make sure the scrip ...
+ ~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidData: (:) [Test-Path], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationErrorEmptyStringNotAllowed,Microsoft.PowerShell.Commands.Test
PathCommand

PS C:Windowssystem32>

can you tell me what I am doing wrong !!!