The 32-bit operating system can only run 32-bit applications, so the technician should execute the 32-bit installer. The "x86" in the file name refers to the 32-bit architecture.
https://www.digitaltrends.com/computing/32-bit-vs-64-bit-operating-systems/

The desktop specialist should use a clean install to refresh the laptop. A clean install will remove all data and applications from the laptop and install a fresh copy of Windows 10, ensuring that the laptop is ready for the newly hired employee.

MDM stands for Mobile Device Management, and it is a way of remotely managing and securing mobile devices that are used for work purposes1. MDM can enforce policies and restrictions on the devices, such as preventing users from installing unauthorized apps, modifying system settings, or accessing root privileges2. MDM can also monitor device status, wipe data, lock devices, or locate lost or stolen devices1.

The issue is specific to the user's profile, so the technician should rebuild the profile. Rebuilding the profile will create a new profile and transfer the user's data to the new profile1

The most likely reason that the system is not utilizing all the available RAM is that it is running a 32-bit OS. A 32-bit OS can only address up to 4GB of RAM, and some of that is reserved for hardware and system use1. Therefore, even if the technician installed 8GB of RAM, the system can only use around 3.5GB of usable RAM. To use the full 8GB of RAM, the technician would need to install a 64-bit OS, which can address much more memory2. The system missing updates, the system's memory failing, or the system requiring BIOS updates are not likely to cause this issue.