Thanks in advance

I've been trying to install Coppermine. on my NAS Qnap TS109-Pro i have used a older version which worked fine But when i install the latest version i get the following results
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Installation completed
Coppermine is now properly configured and ready to roll.
Login using the information you provided for your admin account. Do not hit back, do not re-submit the installer form!
Your server supports the following image package(s): GD Library version 1.x (gd1), GD Library version 2.x (gd2), the installer selected 'gd2'.
Important : older versions of the GD graphic library support only JPEG and PNG images. If this is the case for you, then the script will not be able to create thumbnails for GIF images.
Let's Continue
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On clicking "Lets Continue" I get the following screen >>>
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The installer is locked
• • • ERROR • • •
The installer has already been run successfuly once and is now locked.
If you want to run the installer again, you first need to delete the 'include/install.lock' file that was created in the directory where you put Coppermine. You can do this with any FTP program.
(Go to the main page)
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This happens over and over again (Groundhog Day??). If I delete the lock file and clear the tables out of the database (which are apparently properly set up during each loop of this install), I'm presented with a blank install form again, and the process starts all over. I've tried it about 5 times now and cannot see any hint of the problem.
I'm at a loss because there is no indication of where the problem might lie. I've checked permissions in the folders and for the database user. I can log into the database as this user via the common MySql admin programs. I can log into the site as any user and delete the lock file.
The Web Address to check for your selfs is
http://samueljames.ath.cx/cpg/login.phpDoes anyone have a older version of Coppermine i could download?
Many thanks
Ron