Affinity Designer "incompatibility with 64-bit versions of Windows" [SOLVED]

[NullAllocationError]

I have attempted to download the trial version of Affinity Designer, but (and this holds no matter whether I download the newest version or an old version of it (and yes, I have made sure to clean the previous download out when I try to reinstall it), or even Photo instead of Designer), I get a message to the effect of "The program or feature [address in my temporary appdata that features AffinitySetup as one folder name] cannot start or run due to incompatibility with 64-bit versions of Windows." from my computer, alongside "Failed to start setup. Please contact technical support." from the program itself. Now, to my understanding, Affinity is only available for 64-bit systems, so this is a bit odd. Any thoughts with regards to how I can resolve this?

 

EDIT: Never mind, turned out it was the ".NET 3.5 being active" issue, and I simply hadn't turned it off right.

Edited March 7, 2021 by NullAllocationError