Mr Hall's letter states that about $72,000 was needed to help some students afford a device, and a further $30,000 would be used to train staff.
Prime Minister John Key said he was comfortable with the donation.
"If you look at how someone can get support for their OIO application, one of the things they can do is undertake community projects ... it's no bad thing they can do that, it is a contribution to the community they are effectively investing in."
Swiss national Bernard Jean Sabrier was given consent in January to buy 47 hectares of Bay of Islands land, having said he would donate to the Bay of Islands International Academy to help "address the school's critical needs", namely the support of priority learners and special needs students, and languages programmes.
Mr Sabrier, who has acted as director on the boards of several large European companies, already owns property at nearby Mataka Station.
In March, the OIO gave consent to Hong Kong-based Blue Lake Investment to buy 3,551 hectares of land at Braemar Road, Lake Tekapo for $16,500,000.
That was granted after a pledge of $410,000 to be split between Lincoln University, the A20 cycleway and the Mackenzie Trust.
A purchase of land in Auckland by a Chinese buyer was green-lighted in October last year after the buyer promised to establish a scholarship fund for students at Otahuhu College.
Labour's education spokesman Chris Hipkins said the donation aspect of the Arrowtown land approval was "very worrying".
"That the OIO should be using the sale of sensitive land as a lure to attract money that makes up for Government under-investment in public services."
The fact a decile 10 school like Wakatipu had a large number of students that couldn't afford electronic devices demonstrated the pressure many families would be under, Mr Hipkins said.
OIO group manager Annelies McClure said investments in community projects were offered voluntarily, and specifically allowed for in the law.
