I Purchased the software yet much of the software does not function!

I Purchesed the software yet can not weld shapes or many other features Why

You’re likely not meeting the design criteria required for those features to be enabled. There are many features in LightBurn that are dynamic and only show as available choices when you’ve met the design requirements for them to be usable at that time.

In your example, one condition for Weld shapes is that all shapes must be closed.

Reading through the doc will answer many questions:

If you’re more a video person, there’s a channel for that:

There’s a fairly steep learning curve while you gain the vocabulary to understand the concepts involved; the software works fine after that.