Hi Pieter,
Thanks for using Syncfusion controls.
As per the NuGet package naming standards, we have changed some of the package names only to NetStandard format from Portable. We have not done any of the name changes in Syncfusion assemblies which is packed as NuGet package. So, you can ensure the Syncfusion assemblies version is latest one in your deployment location. If its latest version you can deploy without any issues.
If it shows the assembly version as previous version, you need to uninstall the Syncfusion Portable format(older version) packages from your project and install the corresponding Syncfusion NetStandard packages(latest version). After that clean and build the project. Then you can deploy your application without any issues.
Please let us know if you need further assistance on this.
Thanks,
Abbas K