How to download Quartus handbook with different versions respectively?

I manage to get the quartus handbook from the Intel Link. You may refer to https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/qts/archives/quartusii_handbook_archive_120.pdf

Seems like we did have the handbook in the download center https://www.intel.com/content/www/us/en/programmable/downloads/software/quartus-ii-se/121sp1.html

But, when opened it, it is broken. I will let our IT to check on this.