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You pass INSTALLDIR="C:\Program Files\MySQL\MySQL Server 5.6" parameter to mysql-5.6.26-winx64.msi explicitly, but install location is "C:\Windows\system32\rserver30".
It's a very strange...
Look at mysql-5.6.26-winx64.log:
---
Action start 16:06:03: INSTALL.
MSI (s) (B8:BC) [16:06:03:803]: Running ExecuteSequence
MSI (s) (B8:BC) [16:06:03:803]: Doing action: FindRelatedProducts
Action start 16:06:03: FindRelatedProducts.
MSI (s) (B8:BC) [16:06:03:804]: Doing action: AppSearch
Action ended 16:06:03: FindRelatedProducts. Return value 1.
Action start 16:06:03: AppSearch.
MSI (s) (B8:BC) [16:06:03:805]: Note: 1: 2262 2: Signature 3: -2147287038
MSI (s) (B8:BC) [16:06:03:805]: PROPERTY CHANGE: Modifying INSTALLDIR property. Its current value is 'C:\Program Files\MySQL\MySQL Server 5.6'. Its new value: 'C:\Windows\system32\rserver30\'.
---
It means what mysql-5.6.26-winx64.msi detects already installed MySQL 5.6 in location 'C:\Windows\system32\rserver30\' and try to upgrade it.
You should completely uninstall MySQL 5.6 from server.
Please checks the Windows registry sub-keys of the "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall" key after uninstalling MySQL 5.6.
Please also checks the Windows registry sub-keys of the "HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall" key after uninstalling MySQL 5.6.
I changed C:\Windows\system32\rserver30\ to C:\Program Files\MySQL\MySQL Server 5.6 in "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall" and MySQL was installed!!
Many thank for your hint because i had the same error and it was an config error at the users mysql my.ini config file.
the error i had at the .err file at the plesk user database Folder was:
[ERROR] C:\Program Files\MySQL\MySQL Server 5.6\bin\mysqld.exe: unknown variable 'table_cache=128'
solution:
- set the mysql running Folder at the my.ini back to the mysql 51 and start that service
- delete that config at the my.ini at the same Folder which was at the error file
- install mysql 56 via plesk installer again and it was working.