The error message "Invalid Password" when installing the LXi program means that the password you're using is not for the version of the program that you have installed.
For example, if your password is for the LXi version 10.0.2 but you download and install LXi version 10.5, then when you install the program will return the "Invalid Password" error every time you try entering the password.
The resolution is to download and install the correct version of the program for the password you have. Make sure to completely uninstall the incorrect version before installing the correct version. Click here to download any discontinued version of the LXi software.
If you're unsure what version of LXi to use with the password you're welcome to send an email to support@signwarehouse.com that includes your account information and User ID along with a description of the issue.