Zhangren 丈人: in early times a respectful form of address for elder people (古時對老人的尊稱).
There is difference between the pattern X貞吉 (like in the Judgment of hexagram 2) and 貞X吉 (as in the Judgment of hexagram 7): I believe X貞吉 is a divination about subject X, where 貞X吉 is a divination for subject X. See for pattern 貞…人吉 also Hexagram 32, line 5 (貞婦人吉, 夫子凶) and Judgment of hexagram 47 (貞大人吉).
The Shuowen says that 咎 means 災, ‘disaster’. Duan Yucai 段玉裁 says in his 說文解字注, ‘Commentary to the Shuowen Explanation of Characters’,
It is thought that 災 originally was written as 烖, ‘calamities from Heaven, as floods, famines, pestilence, etc.’ (Unihan database HM). Fire of natural origin is called 災. By extension 災 means ‘disappointment from Heaven coming (to you) ‘.
See also hexagram 1, line 3.
Divination for elder people: auspicious.
There is no curse from Heaven (or the ancestors).