Server-side activities have been updated.

Server-side activities have been updated. You need to restart SharePoint Designer to use the updated version of activities.

Copy following files manually to the locations mentioned below.

Microsoft.SharePoint.WorkflowServices.Activities.Proxy.dll
Microsoft.Web.Design.Client.dll

Download below DLL

for SharePoint Online, you have to copy these files at below location.

%USERPROFILE%\AppData\Local\Microsoft\WebsiteCache\<SiteName>\<VersionNumber>

for SharePoint On-premise, you have to copy these files at below location.

%USERPROFILE%\AppData\Local\Microsoft\WebsiteCache\<SiteName>\<VersionNumber>