LW Pro/OS X 10.4.10 Will Not Open

[Pc89755]

Hi,
Computer illiterate but great with the software so, please be gentle!
Mac Intel OS X 10.4.10
1Gb ram 250Gb HD memory free
Toucan provider
Updated Java and have set up Sharing as requested
Ran Basic LW successfully until I bought Pro.
PROBLEM:-
Downloaded and installed OK but when opening LW Pro 4.14 the instal box gets to 62% and stops.
Basic pro ran without a problem and have dumped LW bits and re-installed both Basic and Pro (not together) but the problem remains.
I am not technically minded but I am competent on a Mac.
Acquisition works perfectly but is not as good as LW.
Help please and will be eternally grateful.
Also, migrating to TalkTalk fom Toucan and am worried about P2P restrictions mentioned in the Forum. Shall I cancel while there's time?
Regards, Martin