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Open File Explorer and navigate to:
%LOCALAPPDATA%\SumatraPDF\
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Create a backup of SumatraPDF-settings.txt:
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Edit SumatraPDF-settings.txt:
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Select and delete lines 3 through 48
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Open your downloaded theme file Copy its contents
6, Paste into SumatraPDF-settings.txt where you deleted the lines Save and close the file
- If SumatraPDF is open, close it Reopen SumatraPDF to see the new theme