good one @Andrew_Milanes
Cloud uses Linux, so you will not be able to open the projects in Mac after processing with cloud due to the version incompatibility. We do not develop Mapper for Mac anymore, the last version was 3.0 (Beta macOS version of Pix4Dmapper 3.0) whereas the latest Pix4D version is 4.5.
Also, keep in mind there is a limit for cloud processing. See here: https://support.pix4d.com/hc/en-us/articles/215858503-Cloud-general-questions#label0