If you don't provide logs, there is no point in reporting issues. This might sound a bit harsh, but we really need them to figure out what is going on.
The materials in the Marketplace currently only work for Ultimaker printers.
Cura 4.11 comes with a set of all new icons, so the tool you are looking for to access "mesh modifiers" may look different now, but it is still there. The support blocker tool (that lets you add the cubes) is the 6th one from the top, the per model settings tool (that lets you change what the cubes do) is the 5th.
Edited by ahoeben
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GregValiant 989
What operating system are you running?
What printer have you installed in Cura?
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