https://community.graphisoft.com/t5/Archicad-C-API/Steps-for-updating-add-on-to-work-with-Archicad-21/m-p/235822#M3948 <BLOCKQUOTE>jcimentarov wrote:<BR />I have a working add-on, developed and working on Archicad 20. When I try to add it in Archicad 21 I get the "outdated" error in the add-on manager. What are the steps to migrate to the newer API?</BLOCKQUOTE> You need to rebuild the add-on against the AC21 API rather than AC20. This will probably entail some code changes – just like ARCHICAD, the API grows and develops over time. How many changes depends on which parts you're using. Wed, 11 Oct 2017 10:18:15 GMT Ralph Wessel 2017-10-11T10:18:15Z https://community.graphisoft.com/t5/Archicad-C-API/Steps-for-updating-add-on-to-work-with-Archicad-21/m-p/235821#M3947 <DIV class="actalk-migrated-content">Hello,<BR /><BR />I have a working add-on, developed and working on Archicad 20. When I try to add it in Archicad 21 I get the "outdated" error in the add-on manager. What are the steps to migrate to the newer API?<BR /><BR />Thanks in advance, <BR />Julian</DIV> Wed, 12 Jul 2023 18:40:13 GMT https://community.graphisoft.com/t5/Archicad-C-API/Steps-for-updating-add-on-to-work-with-Archicad-21/m-p/235821#M3947 Anonymous 2023-07-12T18:40:13Z https://community.graphisoft.com/t5/Archicad-C-API/Steps-for-updating-add-on-to-work-with-Archicad-21/m-p/235822#M3948 <BLOCKQUOTE>jcimentarov wrote:<BR />I have a working add-on, developed and working on Archicad 20. When I try to add it in Archicad 21 I get the "outdated" error in the add-on manager. What are the steps to migrate to the newer API?</BLOCKQUOTE> You need to rebuild the add-on against the AC21 API rather than AC20. This will probably entail some code changes – just like ARCHICAD, the API grows and develops over time. How many changes depends on which parts you're using. Wed, 11 Oct 2017 10:18:15 GMT https://community.graphisoft.com/t5/Archicad-C-API/Steps-for-updating-add-on-to-work-with-Archicad-21/m-p/235822#M3948 Ralph Wessel 2017-10-11T10:18:15Z