Plugin autoupgrade - by: jvillemur

Hello,
We have a problem updating the projeqtor v6.5.2 with the autoupgrade plugin .
In web interface "Plugs-ins-->Mise à jour ..." to choose projeqtorV6.5.7.zip and select "+" , we get the error :

2018-03-08 16:46:55.122 ===== TRACE ===== New installation found : projeqtorV6.5.7.zip
2018-03-08 16:46:55.154 ***** ERROR ***** [V6.5.2] ERROR *****
2018-03-08 16:46:55.154 ***** ERROR ***** [V6.5.2] on file '/var/www/html/projeqtor/plugin/installAuto/installAutoInstall.php' at line (80)
2018-03-08 16:46:55.154 ***** ERROR ***** [V6.5.2] cause = ZipArchive::extractTo(): File exists
( Install dir : /var/www/html/projeqtor)
It is a problem of our installation or a plugin bug ?
Thanks for your help