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I downloaded vanilla 2.3 from https://open.vanillaforums.com/download
I unzipped the zip file and moved the contents to mySite/vanilla/
I changed the access for vanilla/cache/ vanilla/uploads/ and vanilla/conf using chmod -R 777
When I access mySite/vanilla I get:
Index of /vanilla
and a list of files and subdirectories
if I double click 'index.php' I obtain an error message:
The requested URL /vanilla/dashboard/setup was not found on this server.
No dashboard appears.