For Visual Studio 2017 and Visual Studio 2019, the templates extension can be downloaded from Marketplace: https://marketplace.visualstudio.com/items?itemName=sdl.project-templates-for-trados-studio-2019
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In Visual Studio from the menu select "Tools" -> "Extensions and Updates"
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Select "Online" tab and in Search box type "Trados"
From search result install which version of the templates you want.