sh descent3-demo.run

$ sh descent3-demo.run
Verifying archive integrity...tail: Warning: "+number" syntax is deprecated, please use "-n +number"
OK
Uncompressing Descent 3 Demotail: Warning: "+number" syntax is deprecated, please use "-n +number"
..............................................
=============================================================
Welcome to the Descent 3 Demo
=============================================================

Would you like to read the README for this update? [Y/n]: n

=============================================================
Would you like to apply this update? [Y/n]: Y

Please enter the installation path: []: ~/pro

=============================================================
Performing update:
ERROR: Unable to make path ~/pro/demos/descent3_demo
The program returned an error code (3)
$ mkdir ~/pro/demos/
$ mkdir ~/pro/demos/descent3
$ sh descent3-demo.run
Verifying archive integrity...tail: Warning: "+number" syntax is deprecated, please use "-n +number"
OK
Uncompressing Descent 3 Demotail: Warning: "+number" syntax is deprecated, please use "-n +number"
..............................................
=============================================================
Welcome to the Descent 3 Demo
=============================================================

Would you like to read the README for this update? [Y/n]: n

=============================================================
Would you like to apply this update? [Y/n]: Y

Please enter the installation path: []: ~/pro

=============================================================
Performing update:
100%
Product updated successfully.