inno setup - How to determin if folder already exists in innosetup -

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can give me instructions how check if folder exists (right after user selected folder), , if - prompt him similar message attached one?

thank you

enter image description here

to force warning popup (even when application installed , you're going install new version of same folder), can set direxistswarning yes:

[setup] ... direxistswarning=yes

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