topic Re: AC 19 to AC 16... how? in Collaboration with other software https://community.graphisoft.com/t5/Collaboration-with-other/AC-19-to-AC-16-how/m-p/290000#M37865 Should you have to save back to 16, you'll need 18 and 17 as well and 'save as...' from 19 &gt; 18 &gt; 17 &gt; 16 and deal with the pain of no building materials as probably the biggest challenge.<BR /> <BR /> Are they to work with you on the architectural model? Or are they providing some other sort of work? I'm wondering if IFC might be better to just share the model. Tue, 07 Jun 2016 13:48:04 GMT Erwin Edel 2016-06-07T13:48:04Z AC 19 to AC 16... how? https://community.graphisoft.com/t5/Collaboration-with-other/AC-19-to-AC-16-how/m-p/289998#M37863 <DIV class="actalk-migrated-content"><R>hi everyone. i will be working with a team stuck at Archicad 16.... ( and i am currently using V19).<BR /> what do you think is the best format to exchange data ? <BR /> thanks in advance <BR /> <BR /> <IMG src="https://community.graphisoft.com/legacyfs/online/emojis/icon_wink.gif" style="display : inline;" /></R></DIV> Tue, 07 Jun 2016 12:29:43 GMT https://community.graphisoft.com/t5/Collaboration-with-other/AC-19-to-AC-16-how/m-p/289998#M37863 Anonymous 2016-06-07T12:29:43Z Re: AC 19 to AC 16... how? https://community.graphisoft.com/t5/Collaboration-with-other/AC-19-to-AC-16-how/m-p/289999#M37864 Download and install AC16 to your computer. Your reseller can get you the link or ask your colleagues for an electronic copy of the installer. Your license key should be able to run it without problems. Tue, 07 Jun 2016 12:35:15 GMT https://community.graphisoft.com/t5/Collaboration-with-other/AC-19-to-AC-16-how/m-p/289999#M37864 Eduardo Rolon 2016-06-07T12:35:15Z Re: AC 19 to AC 16... how? https://community.graphisoft.com/t5/Collaboration-with-other/AC-19-to-AC-16-how/m-p/290000#M37865 Should you have to save back to 16, you'll need 18 and 17 as well and 'save as...' from 19 &gt; 18 &gt; 17 &gt; 16 and deal with the pain of no building materials as probably the biggest challenge.<BR /> <BR /> Are they to work with you on the architectural model? Or are they providing some other sort of work? I'm wondering if IFC might be better to just share the model. Tue, 07 Jun 2016 13:48:04 GMT https://community.graphisoft.com/t5/Collaboration-with-other/AC-19-to-AC-16-how/m-p/290000#M37865 Erwin Edel 2016-06-07T13:48:04Z