My programmer disappeared and I need to find other: what Do I need to install to open my project?

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Hello my friendS!
I am not a programmer,just an artist, and developing a game with Unreal. My game is almost finished, but, now I need to find a nre programmer, because the previously disappeared.
FIrst, before looking for a new programmer, I want to open the project and make some tests, and make a list with things fix.

Howevver I can´t open the prohect, ths following message appears:

https://scontent.fcpq4-1.fna.fbcdn.net/v/t1.15752-0/p480x480/73233876_2312812618847452_3662214039435476992_n.jpg?_nc_cat=104&_nc_oc=AQlXhX8eVr4oyAOcndLITulX1Pk-rhV6mxfYW7AoQFUhe0K9kMFYqCZa3gzjzlmSTjA&_nc_ht=scontent.fcpq4-1.fna&oh=1181f7c6e84b789a0c13fa19f7c7abea&oe=5E5B4942

SO, my qquestion is, does anyone knows what I do need to install to make the project works?

Thanks for attention!