The customer will be able to download the Hotfix from the TIBCO Support Customer Portal Web UI using their username and password for the TIBCO Support Web page.Once logged on they can find the Hotfix under the Download Menu : OR
The customer will be able to download the Hotfix by using direct link to TRA_Designer/5.10.3/hotfix-01 OR
Refer to  Article 000022290 : How can TIBCO customers download / access all GA hotfixes
Link to Article  000022290 :https://support.tibco.com/s/article/hotfix

Please contact TIBCO Support if you have any problems finding or downloading this hotfix.
Listed below is a summary of updates included. Refer to the associated readme document for any additional information.
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Closed Issues in 5.10.3_HF-001 (This Release)

TRA-5545
Apache Tomcat embedded with TIBCO Runtime Agent has been upgraded to version 7.0.109

TRA-5546
TIBCOJRE has been upgraded to 1.8.0_351 patch version for the windows,linux platform , TIBCOJRE 1.8.0_301 for AIX platform and 
TIBCOJRE 1.8.0_291 for HP-UX platform.
 
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TIBCO Runtime Agent (TRA) 5.10.3 Hotfix 01 is now available.

OS: All

Install the Hotfix by using direct link to TRA_Designer/5.10.3/hotfix-01
https://support.tibco.com/s/hotfixes?id=a014z00000yrdqLAAQ