Help Upgrading Finance Quote

[J]

Dear Sir / Madam,                               I am a long standing user of your great piece of software. However, I have recently been unable to update share prices recently. From searching I understand this is due to Yahoo changes and now Finance Quote 1.2 being required. I have tried several times to upgrade to this using instructions on this page:http://wiki.gnucash.org/wiki/Online_Quotes
It seems to go through loads of stuff and test OK but fails to install permission denied or something like that. Please can you help - is there an easy way to do this?
Regards

Jamie Streeter