Looking at missions.desc, I can see that sections heading (like #
Download links for all missions rated >=7.5 here, with thiefguild.com PK first and thiefmissions.com DL link second. I could get more, but it would need scraping thiefguild.com and I don't know schema. Do what you want with this.
2334 https://thiefmissions.com/download.cgi?m=HornsOfCanzo2
1965 https://thiefmissions.com/download.cgi?m=MysticGems2HeartOfBohn
2819 https://thiefmissions.com/download.cgi?m=TransitionsInChaos1
4029 https://thiefmissions.com/download.cgi?m=Greenbay
3711 http...