Instalation or Installation: How To spell?
The word Instalation is misspelled against Installation, a noun meaning "The act of installing or giving possession of an office, rank, or order, with the usual rites or ceremonies; as, the installation of an ordained minister in a parish."
Installation has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings insta & ation which should not be misspelled with single 'L'
Wrong Spelling:  insta-l-ation  Correct Spelling:  insta-ll-ation 
Find more incorrect spellings of Installation to spell right way.