The game takes up more space in gb than said during installation. Before installing Hollow Knight I had about 10.3 gb free on the ssd then after seeing that I had the necessary space I started the installation. At one point even though during the preparation of the installation it said 1.3 gb and even 7.5 gb and I had 10.3 or more, the installation froze so I canceled and cleaned up the windows updates disk by about 2.5 gb so I should have stayed at 12.5 gb and more (the 10.3 gb before plus the 2.5 gb of Windows update disk cleaning) then I restarted the installation and instead of doing (in the worst case) 12.5gb -7.5gb = 5gb free now gives me 185mb free. How to fix?

The final size of the game should be about 8 GBs. It is still advised to have about double that amount free, because the game will be extracting, copying and then deleting the redundant files during installation.

If you have enough RAM you can do a ramdrive during the installation process, which will limit how much your hard drive gets full; afterwards the moved/deleted files should have no effect.

Sorry for the delay in responding. Thanks but what is this ramdrive? And then isn't there an effective way to really know how much space I have on the ssd and to free it up as much as possible, not for games but for other unnecessary things? I also checked for possible damaged files with the prompt I run as administrator and it found and repaired the files but everything remained the same.

MiB/MB.

As for what a ramdrive is, it's what one would refer to as a "swap space" or "Virtual Memory."; except less abstracted than those two.

Here, you can read about it.

RamDrive is a way to use the RAM memory as a temporary storage space, is much faster than a typical storage (like SSD) and was very used a few years back. IMHO is not the best way to tacke the issue, even if you have 32GB of RAM.

Assuming you have Windows 10, you can clean temporary files on settings -> storage but take care that Windows also consider the Downloads folder temporary files.

Hollow Knight final installation space (Steam version+ DLC's) is around 7.5GB but you need more thna that so the System can extract to a temporary folder before installation. It's well known that GOG's way of install games is not the most efficient and in offline installer (download the game via website and not Galaxy client) case, the system need ~3x the game required space.

Also, it's good practice to always leave at least 10% free space on the system SSD, so the system and SSD can perform well and avoid these kind of issues. I know it's not always possible, since I use a 64GB tablet.
You may need to uninstall some programs/apps/games before installing Hollow Knight, or copy some big personal files to a USB pen drive.

I'm playing it from Asus rog ally. Now that I think about it, I could play a few games on a micro sd since from what I've read/heard cases of damaged micro sd only occur (when they occur) in these situations: with 1 tb or al micro sd maximum with 512gb ones (therefore not with 256 gb ones or less) with micro sd uhs II models and sometimes with uhs I ones (therefore not with slower ones and for some games you don't need too fast sd cards) and if rog ally is set in turbo mode 30-25 watts or at maximum performance 15 watts (therefore at performance 15 watts or at maximum silent 10 watts the sds have no problems) (and even at silent 10 watts we run well, even beautiful games at 720p low and you can see them very well and sometimes even ultra like Skyrim) in other cases there shouldn't be any problems. The only two things I should know is if my micro sd is too old and slow (a Samsung 64gb) and how to set some games to start from there.