Failed to copy!

I have 3 ideas.

1. Maybe you tested running nircmd without closing and re-opening your cmd window first, so in that cmd window it wasn't in the PATH. You can see your variables if you type set in your cmd window.
2. In your .bat file you could specify the full path to nircmd.exe like this:

c:\tools\nircmd.exe win activate process chrome.exe
c:\tools\nircmd.exe win max process chrome.exe
c:\tools\nircmd.exe sendkeypress spc

3. You could try using the "Copy To Windows Directory" button instead of putting it in the c:\tools folder and adding c:\tools to your PATH. C:\Windows is already part of your PATH.

But when I run the commands you asked for I get this:
'nircmd' não é reconhecido como um comando interno
ou externo, um programa operável ou um arquivo em lotes.

My PC is in Brazilian Portuguese but translating it would be:
'nircmd' is not recognized as a intern or extern command, an executable or a batch file.

What did I do wrong?

nircmd win activate process chrome.exe
nircmd win max process chrome.exe
nircmd sendkeypress spc

You'll need to download nircmd first.
https://www.nirsoft.net/utils/nircmd2.html#using

Put nircmd.exe in one of the folders in your PATH environment variable points to, or you can specify the path where you put it like this:

c:\tools\nircmd.exe sendkeypress spc