Hi,
These errors just mean someone asked for none existing files, i.e: $YOUR_DOMAIN/downloader and $YOUR_DOMAIN/HNAP1, none of which are part of the Kaltura installation. Do not know who is making these requests, you can see in the log the client's IP is 92.244.214.67 and 188.0.236.124. You can probably try to investigate what these IPs are but it's nothing that disturbs the Kaltura operation, simply creates HTTP 404 entries in the Apache access log.