Hi @wookiefurball
I think you are facing an old behaviour. I honestly have to say that last time I experienced it it was with SAS 9.3, but you might have something similar.
http://support.sas.com/kb/33/598.html
My suggestions:
1- first check if your depot is complete and no file is corrupted (0Kb) with the /SAS Software Depot/utilities/depotchecker utility.
2- I strongly suggest to try again the installation with no running antivirus, since it might block and quarantine some files.
3- If nothing of this works, you could contact SAS Technical Support or your SAS account manager, maybe you need a different version of a depot, but I personally doubt that. Anyway, they can help you really nicely.
I hope this can help you, please let us know how it goes!
Best regards,
Juan