The vast majority of the data can be accessed without any problem. To add that as a bonus, tickrs is compatible with many external files such as JSON, CSV, XML, etc.
(An extension of Krazyan Kranog's excellent answer).
tickrs parses tick-level data from stock exchanges in CSV, JSON and TSV format. The former two formats are used to export data from exchanges, and the latter one is 50e0806aeb micvass