<span class="searchmatch">installassent</span> third-person plural imperfect subjunctive of installer...
ta.la/ installassions /ɛ̃s.ta.la.sjɔ̃/ installassiez /ɛ̃s.ta.la.sje/ <span class="searchmatch">installassent</span> /ɛ̃s.ta.las/ (compound tenses) past present subjunctive of avoir + past...