Never heard of Partminer before.
Seems they offer a 2-day free membership; maybe someone could create a new account, download all the stuff needed during the first 2 days, then cancel the membership?
Indeed, and I have done that in the past. The trick is coming up with a list of "all the stuff needed", which is why I often wait years in-between until I have a *massive* list. Either that or be generating disposable accounts at a large scale.
The alternative is to have an employer who has access (that's happened before with a friend of ours), or to have disposable income exceeding $1300/yr to pay for the access level necessary to obtain outdated datasheets (unless they've changed their pricing scheme once again)
The other problem is they often list, say, a parts description list from a ordering form or catalog as a "datasheet" - so that listed datasheet may have only one page, with one mention of the chip.
I often these days use icminer.com, which is a free Asian alternative (signed up thanks to Google Translate) and clearly has a partial (pirated?) copy of Partminer in their database. (Sadly they must not have got to SC11046...)