New answers tagged solution-package
You can easily do that either from the Central Administration (System Settings, Farm Solution, click on your solution, and then "Deploy": you can select the ttarget Web application), or from a SharePoint PowerShell console (Install-SPSolution -Identity <WSP_NAME> -WebApplication <Web_App_URL> [-GACDeployment]).
No need to retract the solution. Just install it in your new web application using PowerShell. Install-SPSolution -WebApplication "[Site Collection URL]" -GACDeployment -Identity xxx.wsp
It worked for me after I mapped a new workspace in the team explorer and downloaded the code again and then tried publishing the site to a new Sharepoint site.
Top 50 recent answers are included