[paulotex]

I have a work computer without admin rights, and I was able to install Calibre simply by extracting the msi file. Any other installation process (using a local folder, disabling several installation options) failed.

Note that this way is a bit limited, you don't get file extensions associations with Calibre nor entries in the start menu.

Assuming you downloaded the installer to your usual Downloads folder:

1. Open "cmd":
Start -> type "cmd" and select it. A black window with a command prompt should open.

2. In that window, type
cd Downloads
and press enter.

3. Copy and paste this in the black window and press enter:
msiexec /a calibre-64bit-5.32.0.msi /qb TARGETDIR=c:\users\<username>

Replace "calibre-64bit-5.32.0.msi" with the exact filename of the Calibre version you downloaded. Replace "<username>" with your Windows username (your home folder name).

You should see a progress window for a few seconds and then it disappears.

You can now close the "cmd" window.

4. Using File Explorer navigate to your home folder and inside it you should find a folder called "Pfiles" with the folder "Calibre2" inside. This is what you just extracted from the msi file.

5. Inside this Calibre2 file you'll find the file calibre.exe. Double click on it to run Calibre.