Yes you are right. If you upgrade to the latest version, you can no longer use Grid and Upload for free under the GPLv3 license, and you will have to redo the grid and load controls with a different structure (unfortunately).
As far as I know, you are also not allowed to use the Kendo UI kernel (Apache License, version 2.0) simultaneously with the older version of the Kendo web interface to use the missing controls / widgets, as this implies a dual license.
The following snippet from a letter I received from Telerik:
What does this mean for Kendo UI Web GPLv3 licensees?
Kendo UI - Web GPLv3, Web, DataViz, Mobile Complete - : Kendo UI Core Kendo.
Kendo, :
- Kendo UI Core , .
- Kendo UI Professional HTML5, ,
GPL v3, , .
:
- payup (Kendo UI Pro)
- (Kendo UI Core + )
- , , (- Kendo UI)
, , , jQWidgets. . , , .