Will the trial limitations break a replacement of Attribute Tags inside blocks?

Probably. If you have more replacements than the trial will do then the ones that get missed may break comprehensively when you ATTSYNC that block definition. I haven’t actually tested that yet but I suspect it will break them – badly. Everything else should be 100% reliable in the trial. Tell me if it’s not, there’s a contact link on this the page.

Speaking … ok, writing … of trial limitations, the  Messages and Warnings area will always tell you how many things it really found, even if the trial chaos-monkey hides most of them away from you. The Trial will only do a few replacements at a time. Want them all ? – Buy CAD Replace!