I had the same problem. When extracting the file, a dialog box comes up saying the some of the files have the same place and must be written over or skipped. When you write over or skip and try to run the program, the random symbols box comes up.written over like if you had them already installed?
could it be you have another version of SAI in your computer already? (like the trial one)
sorry I can’t help, this version works for me : ? just try uninstalling everything and try again sdkf