The Windows 10 latest update is all set for the users but the latest update of the Windows will be possible if your computer meets a certain requirement of Disk space. Both 32 Bit / 64 Bit windows should have minimum 32 GB of Hard Disk Space in order to get the update installed on your PC or a Laptop.
The previous Windows update (1809) required 16 Gb for 32 Bit Window & minimum 20 GB for 64 Bit Windows. But this time, the scenario will ask you with a different requirement.
Out of 32 GB, 7 GB will be all reserved for the Installation process. The previous Windows version 1809 will be updated to latest 1903 version if you have the memory as per the requirement.
Troubleshooting If Windows 10 1903 does not install
As soon as you proceed with the installation and the process is stuck, you should not force restart the computer. Just try to reboot the computer in safe mode. If the windows is stuck in boot mode, you have to install the previous Windows version (Any version) using Disk or USB. Install the previous version and free up the disk space (something more than the required of 32 GB).
What if you do not get the Latest Windows 10 1903 for yourself
If the Windows 10 1903 cannot be installed, do not worry about it. You will be able to use the last 1809 version for lifetime. Though, you will get the Windows support most probably till 2021, but the system will run on this OS version until your device is in Working condition.
What is the Windows 10 Strategy for the minimum requirement for the Latest Windows Update
Microsoft is trying to compete the Apple Updates. The Apple updates change the minimum system requirement for the software update so that the user opts for a newer hardware earlier. It could be possible that your computer is absolutely fine but you will move to a newer Computer just to get the latest software on your device. Every decision a company takes is also in favour of the company as well.