Setup wizard on windows checks installation directory only one time and does not recheck when it was changed

Steps:
1. Run installation wizard
2. On the step "Custom setup" set non-empty directory
3. Get message like: "Installation directory 'C:\ProgramFiles\MariaDB' exists and not empty. Choose a different install directory"
4. Change directory to empty or non-exist

Expected result:
Installation continues successfully

Actual result:
Get the message again: "Installation directory 'C:\ProgramFiles\MariaDB' exists and not empty. Choose a different install directory"
And the old directory is present in the message.