Yes. "Required Tekla Maintenance" means you need to buy their subscription to access the forum.
Use "Screen Controller" to solve this problem:
I suggest you go through user assistance pertaining to custom components.
Here is a page where you will find many details to help you achieve that. https://teklastructures.support.tekla.com/2021/en/det_add_variables
This is not a solution I'm just trying to rebuild it. Could you manually edit the inp file of the component using notepad, and then modify the custom component so that the inp file is rebuilt by tekla.
For each version you have build it separately using the reference dll files of that particular version
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