Cannot Install Anti Spam Agents - get-transportserver cmdlet not found

Getting the following error when trying to install antispam agents on hub transport server (single exchange server 2010 environment, no edge server):

[PS] D:\Program Files\Microsoft\Exchange Server\V14\scripts>.\install-antispamagents.ps1
get-transportserver : The term 'get-transportserver' is not recognized as the name of a cmdlet, function, script file,
or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and
try again.
At D:\Program Files\Microsoft\Exchange Server\V14\scripts\install-AntispamAgents.ps1:19 char:20
+ $transportserver = get-transportserver -id $localservername
+                    ~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (get-transportserver:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Failed to find the Transport server: <myserver>

Any help would be appreciated as to where I can find the missing cmdlets or download/reinstall them...thanks