Probably 2 different issues. Venice will crash ET if you don't have the correct keyword-fix version of Fritzbot. See this
thread. mlb_daybreak also needs it and baserace is better with it. Some maps can crash ET if included first in a campaign so check whether you can run them in single-objective mode. Otherwise please list the problem maps in your next post.
Did you rename Fritz_wolken6_b1_wip0.01.zip to Fritz_wolken6_b1_wip0.01.pk3? And place it in your \fritzbot directory? My tests are fine for both sv_pure 1 and 0 settings. You can also test the zip contents with winzip or winrar to be sure it downloaded OK. Now if you unzipped the file instead of renaming it then make sure that you set sv_pure to 0 before starting fritzbot, otherwise the waypoints won't be loaded.
(BTW I did find just a few no goal messages near the end of the match when the second objective is stolen, so I will have to add a few more roams etc. for the allies (denny, disc...). I was planning on adding a special group to be activated when the second objective is stolen to draw the axis to guard the deliver point at the gun. I guess I will have to add some allied actions as well.)