Hi Cameron,
If you already have SupportAssist-1.1.0 msi, then you can double click on that and it will take you through the modify option. Theoretically, you will be able to repair using that.
In case you do not have the 1.1.0 installer, then you can download the same from our support site (www.dell.com/.../DriverDetails).
We're still trying to replicate the issue in our lab and it may take some time before we can provide some work around to fix this issue.
The last option will be uninstall 1.1.0 and install the new version. Please note that uninstall DSET and Lasso (if you have installed these separately) prior to installing SupportAssist-1.1.1.
Thanks,
-Prabhat