Look at these examples of aller in the Conditionnel Passé:
Notice that être is used - not avoir.
Just as with the Passé Composé, some verbs (mostly movement verbs) conjugate with être in the Conditionnel Passé:
je serais, tu serais, il serait, nous serions, vous seriez, ils seraient (Conditionnel) + allé (or other past participle)
Note also that the past participle allé changes if the person doing the action is feminine (allée) or masculine, and singular or plural (allés/allées).
See other lessons on Le Conditionnel Passé:
Conjugate regular -er, -ir, -dre verbs (+ avoir) in the past conditional in French (Le Conditionnel Passé)
Conjugate verbs with irregular past participles in the past conditional in French (Le Conditionnel Passé)
Conjugate devoir in the past conditional in French = should have (Le Conditionnel Passé)
Conjugate pouvoir in the past conditional in French = could have (Le Conditionnel Passé)
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aller

partir

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