All REACH registrations must be submitted using the IUCLID 5 software package, the latest version of which is version 5.4. This is available now and can be downloaded from ECHA's IUCLID website, along with various "plug in" tools [such as the Technical Completeness Check, Chemical Safety Report and Fee Calculation tools]. This website has links to various manuals, FAQ, training, etc.
We recommend that, in preparation for submission of their own Joint Submission REACH registration files, all registrants install IUCLID 5.3 well in advance of their first intended registration date - it can be a time consuming process and not always entirely straight forward. For the avoidance of doubt, please note that whilst the Iron Platform has prepared the Lead Registrants' REACH registration dossiers, all legal entities that participate in the Joint Submissions must prepare their own REACH registration dossiers using IUCLID 5.3.
Installing, understanding and learning how to use IUCLID 5.4 is a challenging task - so that you can achieve a successful registration,
DO NOT LEAVE THIS ACTIVITY UNTIL THE LAST MINUTE!