Hi,
Thank you all for your suggestions I managed to install it finally by deleting some records from the mdfinstalledatabases table.
Now I have another issue and I tried almost all the suggested solutions on the community but in vain.
I get this error on BP pages "This company has not been setup to view the Microsoft Dynamics GP Reporting Services reports. Contact your system administrator. " it is a display issue because I doubled checked all the securities and the reports are accessible and working perfectly if accessed outside BP.
thank you again for your support.
Saad