i am upgrading the version from 12.5.3 to 15.0
As per the referance PDF which are given on sybase site, these are my stpes:

1. checked errors
2. Instalation of ASE 15.0 in new direcotry.
3. run preupgrade utility.
4. run upgrade utility

I run dbcc commands to all databases. there are not any errors on databases. I have installed ASE 15.0 on new directory.

When i execute the preupgrade process from ASE 15.0, it does not give me any error message or success message.
Also when i execute upgrade.exe utility, it does not upgrades the user databases

Can any one tell me that wheather i am doing wrong or missing something ...