The TT Prealgebra disk 3 is not properly working. Please follow the steps below to replace the corrupt virtual CD with a working replacement:

1. Go to Google Drive TT_PreAlgebra disk 3 and download the replacement cd (override any security pop ups).

2. Go to your downloads folder and double click on PreAlg-3.iso to mount it to the BD-ROM drive. Also Launch the TT PreAlgebra program and sign in to confirm the replacement disks works as expected.

3. Got to the TT>PreAlgebra folder on the student pc and rename the bad cd to PreAlg-3-bad; copy/move the replacement cd to the folder. It will look something like--

If you need any help, please let me  know.