The components should be available in SIS Toolbox (not Toolbox).
Please reinstall SSIS Data Flow Components in the following way: create a *.bat file with the line "devartssis.exe /log=Install.log" and run it 'As Administrator'. The Install.log file will be created in the folder where the installation file is located.
Now open the Data Flow tab in your *.dtsx package, navigate to View > Other Windows > SSIS Toolbox (not Toolbox), open the Common section. Are there Devart components?
If there are no Devart components in SSIS Toolbox, please make sure that the Devart.SSIS.%ServerName%.*.dll (* means 110/120/130) assembly is present in:
* C:\Program Files (x86)\Microsoft SQL Server\110\DTS\PipelineComponents\
* C:\Program Files (x86)\Microsoft SQL Server\110\DTS\Connections\
* C:\Program Files (x86)\Microsoft SQL Server\120\DTS\PipelineComponents\
* C:\Program Files (x86)\Microsoft SQL Server\120\DTS\Connections\
* C:\Program Files (x86)\Microsoft SQL Server\130\DTS\PipelineComponents\
* C:\Program Files (x86)\Microsoft SQL Server\130\DTS\Connections\
If there is no such assembly, copy it there from the C:\Program Files (x86)\Devart\SSIS Data Flow\Assemblies\ folder.
If Devart SSIS components are still missing in SSIS Toolbox,
send us:
1) the generated Install.log file
2) Help > About Microsoft Visual Studio > Copy Info
3) a screenshot of the opened Common section in SSIS Toolbox when the Data Flow tab of *.dtsx [Design] is active