Devexpress VCL 18.2.6 full source with DxAutoInstaller 2.2 free can be downloaded from the Devexpress website. Simply visit the website, navigate to the download section, and select the Devexpress VCL 18.2.6 product. Follow the installation instructions to install Devexpress VCL 18.2.6 with DxAutoInstaller 2.2.
If you found a "free full source + installer" package online, it is almost certainly pirated. Using it exposes you to legal risks, malware, and lacks updates/support. devexpress vcl 1826 full source with dxautoinstaller 22 free