please help me to code the following scenario:
- On the Directory Parameter page user types in or selects a default value for the installation directory.
- my code needs to check that entered value
- Upon user clicking 'Next', if my code detects that there is previous install of the product at the location entered in Step 1, then prompt the user to either uninstall at that location, or ask to enter a different location. Do not go to the 'Next' page, i.e. do not continue the installation.
- If user chooses to uninstall, then exit the installer.
- If user re-enteres new location, then repeat validation starting from Step 3.
- Do not continue install until my code validates that the enetered location has no previous install in it.
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