Hi Nicolas,
Thanks for contacting Syncfusion support.
If we install Syncfusion LightSwitch HTML build alone, Syncfusion assemblies will not be installed in GAC and program file location (“C:\Program Files (x86)\Syncfusion\Essential Studio\14.1.0.46\Assemblies”). We have referred the Syncfusion assemblies to the sample from the below system location for LSHTML,
%userprofile%\AppData\Local\Syncfusion \LightSwitch\$version$\HTML\Reference Assemblies
So, obtain Syncfusion assemblies from above installed sample location. Please refer to our below UG documentation for more details,
Regards,
Yuvaraj D