You will not be sinful if you offered Zuhar salah (instead of Jumuah) at the place due to unavailability of conditions that make Jumuah obligatory. It is also among the conditions of Jumuah that the place is a city, town or big village. In addition, jama’ah etc is also a condition. Yes, it is severe sin to miss Jumuah salah, when it is wajib, without a valid reason.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband