> For the complete documentation index, see [llms.txt](https://help.arkance-systems.com/pressure-drops/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.arkance-systems.com/pressure-drops/en/general.md).

# GENERAL

- [Pressure Drops](https://help.arkance-systems.com/pressure-drops/en/general/about.md): Autodesk® Revit® plugin which enables ductwork pressure drop calculation
- [Release Notes](https://help.arkance-systems.com/pressure-drops/en/general/release-notes.md)
- [Installation and Activation](https://help.arkance-systems.com/pressure-drops/en/general/installation-and-activation.md): Installation requirements
- [Installation](https://help.arkance-systems.com/pressure-drops/en/general/installation-and-activation/installation.md)
- [Commercial Version Activation](https://help.arkance-systems.com/pressure-drops/en/general/installation-and-activation/commercial-activation.md)
- [Trial Version Activation](https://help.arkance-systems.com/pressure-drops/en/general/installation-and-activation/trial-activation.md)