Question: How do i change the installment folder?

@Elin33890014az69 Photoshop must be installed on your C: drive (the same drive as the system and user folders). No exception.

I would strongly advise against that. It's the wrong way to go about it.

First of all, the 2 or 3 GB you save are totally insignificant in the big picture. If you're that low on space, you have much bigger problems. Your whole system can freeze up at any moment. I can fill up 3 GB in thirty seconds.

If you're going to use Photoshop in any efficient way, you need twenty times that at the very least. Advanced raster image editing requires huge amounts of memory, much more than any RAM you may or may not have installed. So Photoshop writes temporary working data to disk, known as the Photoshop scratch disk. RAM acts more as a fast access cache.

It is recommended to have around 100 - 500 GB free space for the scratch disk, depending on how big your files are and how many you have open. The scratch file contains all history states for all open documents, plus significant overhead for any smart objects.

In short, you need to start clearing out space.

As a working rule of thumb, a normal configuration of operating system and a range of applications should not take up much more than 100 - 120 GB. If it's much more than that, some housecleaning is in order.

Start by running disk cleanup in Windows. Empty the recycle bin! Get an external drive and move everything you possibly can over. Move Bridge and ACR caches to another drive if you can. There are free utilities like the excellent WinDirStat which can tell you exactly what fills up your drive and where it is.