You are kidding right???  LOL!!!

Here:

http://audio.manualsonline.com/manuals/mfg/marshall_amplification/mg100dfx__mg100hdfx.html

Regards,

Dale.

Well fair enough.  I just searched using Google on an iPad and found that link so it didn't bother me (not to mention the fact that I don't own an MG Series amp.).

Anyways.  Here's a link to the MG Series product page on Marshall Amplification's main website (these are simply support forums so dunno what the OP was complaining about):

https://marshall.com/marshall-amps/products/amps/mg-gold

Each model has a download link:

https://marshall.com/marshall-amps/products/amps/mg-gold/mg100hfx

Regards,

Dale.