Frequently Asked Questions

Astah project files (.asta) are upward compatible. If project files are edited by new version, they cannot be opened in older version of Astah. For information about model versions, click here. If you cannot open project files using appropriate version of Astah, please change the stack size.

6.2.x or later version

1. Open [Tool]-[System Properties]-[File]
2. Specify the appropriate stack size in following option:
   Stack size when creating/importing a project file (1 to 64MB) (Restart Astah)
3. Click [Apply] button, restart Astah and try again and restart Astah
   • You must restart Astah to apply this stack size after changing it
   • Specifying stack size in batch file no longer works after version 6.2

6.1.1 or before

1. Open Astah batch file (astah-pro.bat, astah-uml.bat or astah.bat) with Text Editor (They can be found in Astah install folder)
2. Find the following line
   "set STACK_SIZE=2m"
3. Change "2m" to 3m" or appropriate size
4. Save the batch file and start Astah