The opening of large files is not allowed. (Eg Minecraft etc.) Because there's that it was blocked by the admin. Even a batch is not possible. I do not know about Powershell, but there's another possibility. Lg
Leave it, you get pretty annoying when you chop the school computers.
Are only exe and msi files affected? Perhaps it is possible to open large jar files and start Minecraft in the same way.
How about if you make your downloads at home?