The viewers are free and AFAIK will remain that way: The BIMx viewer for iPhone/iPad (IOS) available from the IOS App Store is free. The BIMx viewer for Mac and Windows downloadable from the GS web site is free.
A license for BIM Explorer app and add-on to generate the BIMx model file, which is free to all this month, is listed on my reseller's (USA pricing) web site as $645 for ArchiPLUS subscribers, and $1,295 retail otherwise:
http://www.visualmotion.com/pageview.aspx?id=30773&sp=17838
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