If you prefer adding references manually, they are located in: C:\Program Files (x86)\DevExpress 18.1\Bin\Framework\
DevExpress does not offer direct public downloads for old versions without a valid subscription. However, if you or your company holds an active or expired license, here is how to legally obtain . Devexpress 18.1 Download
: Improved performance for WinForms controls like the Data Grid and PDF Viewer, allowing for faster drawing and high-DPI support. If you prefer adding references manually, they are