: Select 7-Zip > Extract Here or Extract to "esp530/" .
: Ensure esp530.7z.001 and esp530.7z.002 are in the same folder.
: Right-click on the file ending in .001 .
: If you don't have it, download it from the official 7-Zip site .
This file is the of a split compressed archive. To open it, you must have all other parts (like .001 , .003 , etc.) in the same folder. How to Extract
The software will automatically pull data from part .002 to complete the file.