In windows, most software would need an installing before usage yet some can be opened directly. For example, Blender is a 3D software that can be downloaded in two forms: one that can be installed and the other in “portable” form that can be directly used even when it’s inside a flashdisk. How can this be so? Why not all software require installation or not?
In: Technology
When your software gets installed it meshes itself into your OS (windows or mac). This allows your computer to recognise .blend files, give blender special permissions, give it better access to hardware and firmware, and allow it to access most files on your computer.
Portable versions are limited in all these, they’re meant to be put on flash drives (hence the name portable) so you can plug them into any pc and work.
Edit: I almost forgot compression! Setup files are compressed into smaller data to makes downloads faster. A majority of the installation process is simply decompressing the data to make it usable.
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