HitmanPro ALert unable to install because of it being managed by sophos.

I used this PC to test Intercept X, I thought I have removed it and I have bought Hitman Pro Alert Lic for the next 3 years and was planning to install it but once I hit install it tell me that this is "managed by Sophos"? and I can't install it.

 Did I just waste my money buying the license if this beta test can not be uninstalled?  

How do I get rid of this overlord?