its always better to renew imho you can even renew it if it has expired within 30days, I suppose you bought a new sub already so that's not an option.
you do not by new sub every month/yeah for cable, sat, amazon, netflix, or anything else its usually automatically renewed if you choose to.
keep your first order, donation, and email used in a txt file, it is easy to make backups to flashdrive, ext hd, other computers, cloud or whatever, and you can add other handy stuff like epg links, full portal urls etc so you do not have to dig through the forum when needed. if you only find a old copy somewhere its still ok coz the most important stuff is static.
but that's just my humble suggestion to make things easier. and its always easy to be "back smart"
that being said your mac will clear at some point.