|Lets get the terminology right. Downloading means transferring data from a server to a client over a network.|
Installing a programme from a disk is just that, installing.
However, as it was over a year ago, reverting back to a previous restore point will not be an option.
Try doing a repair install. This will rewrite the registry and you will lose all updates and they will be needed to be installed.
If you had terminated the installation correctly you woad not have had this problem. Rebooting or removing the disk half way through an installation is not the way to do it.