The only working link is currently MegaUp

Early Access are all garbage. Making people wait and pay for an incomplete game that may not even get finished.

It's not, all files are scanned before being uploaded. Your browser is detecting the crack files as a virus. It's called a False Positive, it's what happens when harmless (albeit modified) files are detected as being malicious even though they're not.
Try using an actual download manager to download the file. Downloading through the browser is not recommended anyway since it causes downloads to slow down greatly

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99.8 MB RAR - early access