Natalija:
ArchiCAD 13 cannot open ArchiCAD 14 files. The only way to open a 14 file in 13 is to open the file in 14, then
Save As... an ArchiCAD 13 file. So you need to get 14 working, or find someone else that has 14 and can Save As... the files back to 13 for you.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David