TestLink

I'm not able to upgrade or install a new copy of Testlink 1.9 RC1 in place of a working Testlink 1.8.5 installation.

I get the following error
PHP Notice: Undefined index: installationType in C:\testlinkwww\testlink\install\installCheck.php on line 40

This happens whether I choose to upgrade or install a new copy.

Any suggestions on how to fix this?

if you found a bug -> create issue on mantis
Change you php.ini settings in a way this does not become a blocking error.
Anyway Search on mantis to see if this has been reported and FIXED -> i think this has been done on 1.9 RC1.
ALWAYS detail your TL version