Thank you for posting on the iTWO costX Student Forum.
Please could you try the following solutions and see if this resolves the issue? If you still encounter issues, please send an email to firstname.lastname@example.org.
1) All Microsoft Updates have been installed.
2) Any antivirus installed (other then Microsoft Defender) may needed to be stopped or removed (if free).
3) Use the right click on the installer file and use “Run as Administrator” for the install.
iTWO costX Forum Admin