The End User Cancellation section defines options that may allow users to postpone the installation.
EndUser Cancellation section
Use this setting to activate end-user cancellation. It is polite and could even be business-critical that end users are questioned prior to installation.
Use this setting to specify the number of times an end-user can postpone the installation.
Specify zero to allow unlimited cancellations (9999)
Use this setting to apply a date after which no further cancellations will be allowed. Leave this blank to allow perpetual cancellations until the cancellation limit (if any, see above) is reached. Select the date using the short date format established for your operating system. Usually, this will be according to the standard for your country. Alternatively, you can select a date from a calendar by clicking on the Browse link, which opens a calendar in a pop-up window.