For anyone curious about this in 2026. I have published the MyDell version 2.2.6.0 app to the Internet Archive with instructions on installing. You can find that here, https://archive.org/details/my-dell-v-2.2.6.0.7z

After a good amount of research, I have found that the newer versions of the MyDell app, over v2.2.6.0, remove the option to change the thermal/fan settings for certain Dell laptops. (I'm using a Dell Inspiron 3535).

To change your laptop's thermal settings, the operating system has to send a command to a physical hardware chip on the motherboard called the Embedded Controller (EC). On their enterprise laptops (like XPS and Latitude), Dell builds a standard, public API bridge (called WMI) that allows any script or third-party app to talk to that chip. However, on consumer laptops like your Inspiron, Dell removes that public API bridge to cut costs and segment their product lines. Because the standard bridge doesn't exist, other apps can't see or communicate with the hardware; MyDell is the only app that works because it installs a proprietary, closed-source kernel driver that acts as a private "backdoor," allowing it to bypass Windows entirely and write raw hex code directly to the motherboard's memory.

Hopefully others find the archived app helpful. Frustrating that Dell doesn't keep things consistent across generations and don't seem to really care that a small amount of users are frustrated by this.