Will open office work in place of Microsoft office?

I am taking a college class CIS 101 and Microsoft Office is required. I have the student edition but it does not have access included and access is required. I tried downloading the professional version for free from Microsoft but it kept saying my computer was offline, and now it says I have tried to many times. Will open office work, or is it different enough that I won’t be able to complete my assignmnets? Thank you!