Instructions: 

1) Copy the contents of the .dmg file (the REALbasic folder) to your Applications folder. 
2) Enter the Name and Serial Number to unlock the capabilities of the professional version. 
3) Enjoy! ;D 

System Requirements: 

Macintosh: 
REALbasic IDE: 
PowerPC Macintosh, including G3 and G4 
System 8.6 or later, including Mac OS X (10.1 or later required) 
32 MB available RAM 
20 MB free hard drive space 
Compiled Macintosh Application: 
PowerPC Macintosh, including G3 and G4 
System 8.6 or later, including Mac OS X (10.1 or later required) 

This version is very rare to find (now I believe it is impossible to find it)... Remember to thanks BleaneBWT for having preserved the original disk image, and for having shared it with you. 

This version of REALbasic was one of the best and is also able to compile CARBON APPLICATIONS.

Sorry for the bad english!