I’m doing same for products that come with different options, like for example one is complete project with animations and composition files etc., other is only models.
Links indeed not work.
Its probably to prevent people from posting direct links and do direct transactions?
Anyways, CGt probably has good reason but then again its beneficial to be able to tel about relating options and link to them in the descriptions.
Maybe CGt could make a system that allows linking but only when it contains CGt URL in it?
On other hand its very easy to highlight the line and drag it in a new browser window, or just right click and select open link, everyone knows that right?