Glad it was of help for you, I took me quite a while to figure this out as well, wish Epic would make changes like this more transparent.
Its not been removed its a bug and its been reported some time ago it dates back to v4.10.
For me it has been still working with 4.11 and apparently the checkbox was added again for 4.14 Unreal Engine Issues and Bug Tracker (UE-34433)
Has anyone gotten this to work with 4.14? Seems like this project was abandoned. 
yes it’s working without any problems
Hi Staggerlee. I’m trying to make a full width item for the inventory (9 tiles long), but if I try to pick it up it just drops to the ground instead. There should be enough room available - inventory 9x5/weapon 9x2… Any ideas why this is happening?
Thanks
I don’t have issues with long items, did you make sure that the Inventory supports 10+ slots in width? A item set to 9 width will take up 10 slots as counting starts at 0 and not 1.
Anyone have any luck getting this to work on 4.21?
Used to love this Inv Sys but just realized I havent used it in over a year and it it is rather unwieldy in current builds of the engine.
Ya, it is a shame I liked it but since it was abandoned it is just too much of a pain to get working in newer editions. The newer advanced jigsaw inventory is pretty good though.