I don't believe that there has been an export option to Artlantis 4.5 for some years now. Cannot recall the last version that supported it. The exporters that are available for 14 and 15 are for Studio and Render 2 and 3.
Abvent dropped support for 4.5 some time ago, offering a last-chance upgrade to users to Render or Studio. AFAIK, there is no upgrade pricing any longer.
Artlantis 4.5 was a pretty doggy piece of software IMHO - eating up 100% of CPU time when at idle, having a really peculiar interface, and not having any kind of radiosity solution resulting in what today, 10 years later, would be sub-par renderings.
Render/Studio 2 and 3 bear no resemblance to their forebear, being fast and (relatively) intuitive and performing renderings - both real time preview and final render - using as many cores as are available.
If 4.5 is your only Abvent option - I would use Lightworks in Archicad instead. Limited as it is, it is better IMHO than 4.5.
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB