Android 10 (if that's not an error) is rather ancient, I'm on Android 16.
I tried that site (Firefox under Linux, private mode) and the following appears to have worked:
- Free Download
- Create download link
- Click here to download
Unpacking the zipped file showed the contents to have the same number of bytes as the originals I downloaded from BtFH in 2012, there were 4 chapters and one css element. The css was identical, the only difference with Part_One was a 6 hour discrepancy in the "Originally posted on" timestamp and that is down to whoever performed the download having been on US Eastern time. The same applied with Part_Two and I did not bother checking the other two.
I've seen that site before and am very cautious with it but have never actually had a real problem with it under Linux.