If you are a student, teacher, or educational institution, you are entitled to the full functionality of Archicad 26 without paying for a license. Sign up at MyArchicad.com.
While "free license keys" for Archicad 26 are commonly advertised on third-party sites, these are almost always unauthorized "cracks" that carry significant security and legal risks. For legitimate free access, Graphisoft provides official paths through educational and trial programs. Official Ways to Get Archicad 26 for Free : archicad 26 license key free extra quality
Official 30-day trial of ArchiCAD 26 (now ArchiCAD 27/28 is current) is available from Graphisoft's website with no credit card required. If you are a student, teacher, or educational
Websites claiming to offer "free extra quality" license keys or cracks for Archicad 26 pose significant risks: For legitimate free access
Even if a crack "works" temporarily, Graphisoft's license validation will detect it during updates, and you'll lose access – often mid-project.