Yup, I must have downloaded the extension (don't ask me when) because the one I need is in the draggable list on the toolbar tab.
Thanks!
You want to make sure you have the most recent version of the extension.
Starting in the upcoming VASL6.6.7, some extensions will be available for downloading from within VASL (users will have to choose to update; it will not be automatic). All 6.X extensions will eventually be available this way; it will be an iterative build up.
As for overlays,
@zgrose is partially correct. Some overlays still need to be downloaded but some are now subject to the same auto-synchronization as boards. Again, I am adding them iteratively, it is often a question of how much I can get done from one version to the next. I think most of the MMP overlays should be auto-syncing. Less so for TPP.
BTW, personally, I favour having both the traditional overlays installed and the overlays extension. Both are excellent. The draggable ones from the extension are easy to manipulate and contain new overlays. The traditional ones are now starting to work with los checking and are better able to handle terrain transformations. This too is happening bit-by-bit.
