Boxed version if and when they release it from N3V, will be up to date, not the original version. Third party suppliers? probably the old version, so not worth bothering with given the large number of updates required, some being 4 or 5GB.
Purchasers of boxed versions of TANE and TRS19 have always been allowed to download the digital version, nothing unusual there. Having access to the digital version is a must if you want to beta test at any time.
1.3Mbps is way below the minimum BT provide which should be at least in the 8 to 10 Mbps range. May be better off with a 4G router and a data sim which is what I was using at my previous location, drawback was it was capped at 30GB however, it was 60Mbps download when busy and 100Mbps after midnight. In fact I used it here while waiting for BT to install my Fibre which took around 6 months, just swapped from ADSL to 4G when downloading.