Steps to add and deploy a solution to a Farm
A.
Use PowerShell Comdlet Add-SPSolution –LiteralPath
“C:\Deployment\MySharePointSolutionPackage.wsp”
B.
Use Stsadm Command stsadm –o addsolution –filename
“C:\Deployment\MySharePointSolutionPackage. wsp”
C.
Go to Central Administrator Site actions then to site settings and enter new package
D.
Use PowerShell Comdlet Update-SPSolution –Identity MySharePointSolution.wsp –LiteralPath “C:
\Deployment\MySharePointSolutionPackage.wsp” –GacDeployment
Explanation:
In SP 2010 you need to use PowerShell to Add a new package because it requires an administrator to
install
I found the answer on this website http://www.sharepointanalysthq.com/2010/08/sharepointpowershell-forsolution-deployment-wsp/