Interesting pair. BTCTek.com is the stronger asset here; the 'Tek' suffix is trendy in Web3 and makes for a solid startup brand. DownloadBTC.com feels a bit legacy (Web 2.0 style), but it still has utility for a wallet or software gateway.
Estimated Value:
BTCTek: Mid $xxx wholesale / $3k+ end-user.
DownloadBTC: Low $xxx wholesale / $1k+ end-user.
Overall, a decent crypto-focused duo