It seems like Roon had some problem with thier update server that they fixed today. See here for more details.
Roon ARC is a totally Seward app for your phone and if you have 2.0 installed it won’t do any harm to give it a try if you want. Your 2.0 core will support ARC and your 2.0 remotes work with you core regardless
Given that over 100000 have downloaded ARC the problems reported are relatively small in number and if the problems you have are to do with port forwarding like most of the others then you will have to work through that someday as ARC updates won’t fix that until they come up with a different artictecture for connecting to the core which I don’t think will be for a long time. If you want ARC the only benefit from waiting would be that support might be less busy. However you can give it a quick try and if you are one of the majority it works for great. If not you could then wait.