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 Le Conditionnel Passé (past conditional)
Conjugate verbs with irregular past participles in Le Conditionnel Passé (past conditional)
Conjugate devoir in Le Conditionnel Passé = should have (past conditional)
Conjugate pouvoir in Le Conditionnel Passé = could have (past conditional)
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aller

partir

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