[UPDATE: Problem solved by deleting CatalogRepository - but I'm still interested in the Pros and Cons for using the...

[UPDATE: Problem solved by deleting CatalogRepository - but I'm still interested in the Pros and Cons for using the ISO image]

It's now the second day I can't install RAD Studio via the Web Installer.
As I have to get forward with this I consider using the ISO image for installation.

Are there any pros and cons using the ISO image?
Is there a known error that might prevent installation via the Web Installer?
[Edit: download seems to work for DirectX and Interbase components, as soon as the download of Common Core components starts, the installation stalls]