sorry for the bad download link... looks like dbc cannot be found on the internet anymore...
anyhow you are not looking for 1.13 but for 1.2(1.14) as 1.13 is outdated for compatibility problems.
a solution for you could be to buy a physical version of darkbasic (classic) or dark game studio on ebay,
then you can send a picture of you with the boxed product to a tgc staff member
and they will add the electronic version to your account so that you can get the latest updates...
or write to tgc and maybe they will send you dbc for free but I am not aware about how much dbc is or was free...
or go for dbpro which is now free lol
you can try shooter 1.0 my new dbc game made with the 1.2 version of dbc, if you want a look on what can be achieved with dbc nowdays, it's available on my website.
feel free to visit my web site