> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/efr-user-manual/getting-started/installing-enercalc-for-revit.md).

# Installing ENERCALC for Revit

How to install the ENERCALC for Revit add-in and approve it on first launch in Revit.

ENERCALC for Revit is powered by a Revit add-in that installs to one or more versions of Revit, as desired by the user. Upon purchasing a subscription or initiating a trial, you will receive an installation download. Prior to beginning installation, close all instances of whichever versions of Revit will be used in conjunction with ENERCALC for Revit. You may begin the installation process by double-clicking the installer `.exe` and following the prompts in the installer.

Upon completing installation, the first launch of Revit afterwards may result in the following message.

![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-24143bf80611950a959482340aed2e98971f41c6%2Fclip0001.png?alt=media)

Select the “Always Load” option to allow Revit to trust the ENERCALC for Revit add-in in the future and avoid subsequent notifications.

![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-98ac645535e61be71b8e4f1927f371b2b5909a12%2Fclip0002.png?alt=media)


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