You can find a list of patches for release 5.5.1 below. Each patch has a list of bugs that it fixes and instruction on how to apply it to your current installation of 5.5.1. Make sure that you have a backup before applying the patch.
Patch A Auguest 9, 2021
This patch fixes the following bugs:
- BOM Characters Cause CSV Import to Fail (Bug #4399)
 - CSV Export Doesn't Export Numeric Fields With 0 Digit on the Left Hand Side Correctly (Bug #4766)
 - MySQL Read with Hold Can Crash the Process (Bug #4767)
 - CSV Export Doesn't Wrap Text with 0x0D in Quotation (Bug #4814)
 - Scratch Memory File Issue (Bug #4845)
 
To apply this patch do the following:
- Make sure no one is using APPX.
 - Kill the APPX license server process.
 - Make a backup of APPX.
 - Copy "appx" (or "Appx.exe" on windows) from the patch folder to your APPX installation directory.
 - Set the appropriate permission for the newly copied file.
 - Run appx, check the version and make sure that it is the new version.
 
APPX 5.5.1a - Windows
APPX 5.5.1a - Linux
APPX 5.5.1a - AIX
APPX 5.5.1a - HPIA
APPX 5.5.1a - Solaris

