Official holds only show up cross-game if they've been linked to your account. I think how this works is you should've got an email with an activation link way back when you bought TCB.
Ok, I definitely bought TCB... 14 years and 3 computers ago. (I've verified that I've bought and played TCB by going to the holds page and finding my Caravel Net records of playing it) There's no way I'm going to find that email. I have download keys available for all the other official holds via my forum account, and I have been accessing them over the last couple of months to install the games on my current laptop. I can't get one for TCB because there it doesn't seem to be linked from any of the places that the other holds are linked from.
You can try contacting support, or PMing mrimer.
Yeah, that seems to be my option.
Then there's also the option of just picking up the Steam versions. These come with 5.0 versions of the holds by default. The purchases tab lets you claim steam keys for anything that you own on caravel. Also, steam's summer sale is on for a few more hours.
I can't install Steam on this laptop.
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