I have a 1 terabyte drive and photoshop and Lightroom classic will not install. Both are saying not enough space, error 133 but I have a new drive so it's empty
How much space is free on the system drive? What is your system?
This is the Adobe Help page for Error 133-
And note the link within for-
The system requirements do require some free space on the primary hdd if you are using an external that is connected. To be honest if you scroll through all of the posts on the forum you will find plenty that lead me to believe while installing on an external drive is an option it is not recommended and you would be better off installing all Adobe apps on the main drive with all of your photos/files on the external.