Save the project as an 'archive' in 11.
Open the archive in 12 and, when prompted, save extract the library parts to its own project library in a location of your convenience. Load the AC12 library and use the 2 libraries in tandem to complete your project.
This has been S.O.P. for users for a long time when it comes to migrating projects from previous versions.
HTH's!
Mark
ArchiCAD 12 2523 USA Full + 11, 10, 9 & 7, Mac G5 Dual 2.3 Ghz, 1.5 Gb, OSX.4.11, HP T1100, Epson R1800
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Mark R. Wallace AIA
Mark R. Wallace AIA
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MacBook 2.53 Ghz, Intel Core i5, 8 Gb,
Mac OSX (Sierra 10.12.6,
ArchiCAD 22 USA Full, +21, & 20.