I checked the log & it showed:
[25-Nov-2018 04:48:51 UTC] PHP Fatal error: require_once(): Failed opening required ‘E:\Inetpub\vhosts\indianphilosophicalcongress.in\httpdocs/wp-load.php’ (include_path=’.;C:\Program Files (x86)\Plesk\Additional\PleskPHP71\pear;.\includes;.\pear’) in E:\Inetpub\vhosts\indianphilosophicalcongress.in\httpdocs\wp-blog-header.php on line 13
This morning I ran the install again without changing anything in particular & it completed successfully! So, if you can let me know why the above error may have occurred, I can deal with it if it happens again. Thanks.