Unable to install Baclup and Report Plugins properly

Hello,
i brought 3 plugins, and im unable to instal 2 of them , upload the zip file from the button on the plugins management page , then i click ont the "+" to install the pluglin and this is what i get :

i.imgur.com/E69uH1G.png?1

on the message on the log
2019-04-30 16:17:00.441 ===== TRACE ===== New plugin found : backupDatabase_V1.2.zip
2019-04-30 16:17:00.456 ===== TRACE ===== Plugin unzipped succefully
2019-04-30 16:17:00.458 ***** ERROR ***** [V7.4.4] ERROR *****
2019-04-30 16:17:00.458 ***** ERROR ***** [V7.4.4] on file '/var/www/html/projeqtor/model/Plugin.php' at line (171)
2019-04-30 16:17:00.458 ***** ERROR ***** [V7.4.4] cause = copy(../tool/dynamicDialogBackupCron.php): failed to open stream: Permission denied

Same when i tried to install the Template Report plugin :

2019-04-30 16:17:17.277 ===== TRACE ===== New plugin found : templateReport_V2.0.zip
2019-04-30 16:17:17.329 ===== TRACE ===== Plugin unzipped succefully
2019-04-30 16:17:17.331 ***** ERROR ***** [V7.4.4] ERROR *****
2019-04-30 16:17:17.332 ***** ERROR ***** [V7.4.4] on file '/var/www/html/projeqtor/model/Plugin.php' at line (171)
2019-04-30 16:17:17.332 ***** ERROR ***** [V7.4.4] cause = copy(../tool/dynamicDialogTemplateReportSelectTemplate.php): failed to open stream: Permission denied

Can you help me please to install them properly.

hello,

thanks for the fast answer but my php user is www-data and he is owner of the projeqtor folder :
when i type :
ls -dl /var/www/html/projeqtor
this is the result :
drwxr-xr-x 12 www-data www-data 4096 May 2 08:46 /var/www/html/projeqtor

ok j'ai du faire un chmod 777 sur tout le dossier projeqtor (même le chmod 775 ne suffisait pas)
j'ai rétablit aprés avoir installé l'application.