You can download this Hotfix from TIBCO Support Portal (https://support.tibco.com).  You will need to provide your TIBCO Support Portal credentials.  
Once logged in you can download the hotfix by selecting the “Downloads” -> “Hotfixes” option, then navigate to /AvailableDownloads/BusinessEvents/EnterpriseEdition/5.5.0/hotfix-04 to download the Hotfix.

Alternatively, you can use the direct portal link to download Hotfix-04
https://support.tibco.com/s/hotfixes?id=a011a00000HK75oAAD

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Closed Issues in 5.5.0_HF-004 (This Release)

BE-26584
There was no pooling support for TIBCO ActiveSpaces 3.x connections.
Now, a new API Store.ConnectionInfo.setConnectionPoolSize is added to set the pool size.  

BE-26499
In TIBCO BusinessEvents Enterprise Administration Agent, the timeout value could not be configured. 
Now, you can configure the timeout value using the new optional parameter -gt while executing any of the python script files. 
The default value is 30 seconds. The maximum timeout you can set is 120 secs. 
If you want to set timeout more than 120 secs, you must change the default value of tea.agents.request-timeout property in TIBCO Enterprise Administrator server configuration file (tea.conf).

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Please refer to attached hotfix readme file for installation instructions, affected files and list of fixes in this release.