Searching for and downloading "cracked" software like ENVI 5.6 is highly discouraged due to significant security and legal risks
Alternatives: There are open-source alternatives for image processing and analysis, such as QGIS, GRASS GIS, and GDAL. However, these may have a learning curve and might not offer the same level of functionality or support as ENVI.
If you are looking for alternatives to ENVI 5.6, there are several options available, including:
Alternatives and Open-Source Options