Navigate to location where sqlcesa35.dll is located. You will find a web.config located in that directory. In web.config add the line
<handlers accessPolicy="Read, Execute, Script" /> line after <directoryBrowse enabled="false" />
<?xml version="1.0" encoding="UTF-8"?>
Save and restart the website.
This worked for me. It was downloading the .dll file rather than executing it
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