[nik1967]

icq99999999,

Как бы справку нужно хоть иногда смотреть!

[Setup]: Uninstallable
Valid values:
yes or no, or a boolean expression
Default value:
yes

Description:
This determines if Inno Setup's automatic uninstaller is to be included in the installation. If this is yes or to a boolean expression evaluating to True the uninstaller is included. Otherwise, no uninstallation support is included, requiring the end-user to manually remove the files pertaining to your application.

Setting this to a boolean expression can be useful if you want to offer the user a 'portable mode' option.

Example:
[Setup]
Uninstallable=not IsTaskSelected('portablemode')

[Tasks]
Name: portablemode; Description: "Portable Mode"