The phrase indicates that the portable package is packed in a RAR archive and has been updated to the final, stable sub-version of CC 2015 (11.x). This often includes: Patch fixes for known 2015 crashes.
If you encounter errors like "installer file may be damaged" while installing the official CC 2015 version: How to Download and Install Adobe InDesign adobe indesign cc 2015 1250 portable x86x64 rar updated
Projects created in 2015 are fully compatible, whereas opening newer files in older software can sometimes cause layout issues. Key Features of InDesign CC 2015 (v11.0.0.1250) The phrase indicates that the portable package is
Enabled seamless sharing of assets like colors, character styles, and graphics across different Adobe apps. and graphics across different Adobe apps.