Some of the big packs will get quick updates for new version.
I've not received any feedback yet from costumers, but anyway I've come to realise that using big scenes from some of the 5.5 version updates end up with a bigh memory crash. (tested up to 32Gb RAM)
In my experience that could happend with only the bigger ones, like the last SP demo. If you dont find any troubles with this, you can play along with the asset as usual. In case that issue happend to you, please wait until new quick update. It's in the way. I think it's related with the changes on the lighting system.
I'm trying to get response from unity support to fix it as soon as possible. Assets affected will be updated very soon. Thanks for your patience.