lightroom download from Adobe site stops after 327mB instead of 744MB. Can someone help?

try a different browser and/or different wired connection and/or a download manager.

or

if you follow all 7 steps you can directly download a trial here: New Adobe Lightroom 6 (CC) Direct Download Links – Free Trials | ProDesignTools  or  New Adobe Lightroom 5: Direct Download Links + Difference vs. LR4 | ProDesignTools or Direct Download Links for Lightroom 3 and Photoshop Elements 8 | ProDesignTools

and activate with your serial number.

if you have a problem starting the download, you didn't follow all 7 steps, or your browser does not accept cookies. 

the most common problem is caused by failing to meticulously follow steps 1,2 and/or 3 (which adds a cookie to your system enabling you to download the correct version from adobe.com). 

failure to obtain that cookie results in an error page being displayed after clicking a link on prodesigntools.com or initiates the download of an incorrect (eg, current) version.