I also tried the Web installer own-cloud on my shared web space and after the second step of the install wizard i get this error on Massages display:"SSL Certificate Problem, they verify that the CA Cert is OK.
Detail: Error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed SSL certificate problem, verify that the CA cert is OK.
Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed"
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RapidSSL Certificate