Password challenge displays while installing IMAGINE software.
The ERDAS software installation is not login protected. There have been instances where executables and installations are password protected as a security measure on the host machine but this is not coming from the ERDAS software.
In the case of a password challenge when unzipping from WinZip, using 7-Zip has been used as a possible alternative. Check to be sure that you are not violating any security measure implemented by your organization before bypassing the password challenge.