Difference between quick and normal installation of expansion packs

[NAMA]

Can somebody explain to me the difference between quick installation and normal installation of expansion packs. I sometimes get the message on my PSR-SX700 that quick installation is not possible.
Thanks in advance.
Bert

[ckobu]

In short: quick installation is just an upgrade of existing material installed in Expansion Memory on the keyboard, watch this video which describes why quick installation is sometimes not possible (07:19 sec) (English subtitles)

https://youtu.be/xj8Anf4B3sY

[NAMA]

Thanks for your reply. Unfortunate I do not understand this video because I do not speak that language.

[ckobu]

Include English subtitles, the translation is accurate will help you understand the content.

https://youtu.be/gnqXkoDaKQ4

[NAMA]

Thanks, now I understand.