How do I get my Photoshop installed? Get 7Z file,not exe when downloaded  Photoshop_12_LS1

You should see two files for Windows in the download area. One is the 7z, but the other is the .exe that will open the 7z and create the folder with the installer inside.

File 1 of 2 is the 7z, File 2 of 2 is the .exe  Be sure they are downloaded to the same location. Your Desktop would be best.