The novice spreadsheet is showing #ERROR in cycle sheets.
Hey there! Thanks for letting me know about this. You’re right - they’re super messed up. Honestly I am not sure if I can fix them.
However, you can download the spreadsheets from the original source. They do work in Excel, just not Google Sheets.
http://www.pro-technix.com/information/downloads/pages/HST-spreadsheet.zip
I’ll update the HST page.