instant wordpress

I installed instant wordpress on my computer to test themes etc. InstantWP had message that I needed to update the wordpress within instantwp. This update is supposed to happen automatically but it could not write one of the files.
I am hesitant to update manually as I am a rank beginner and get lost quite easily.
1st – I question if I need to update wordpress at all, since I just installed instantwp yesterday. Surely instantwp includes the most recent version of wordpress?
2nd – If I don’t update wordpress, will I still be able to move the website I create to my host?
thanks in advance