I've tried the 2 rescue packs, the screensaver and the downgrader.
The log file seems to be ok and the coward's rescue pack and the screen saver are working as advertised

but I was a bit to nervous to try the downgrader yet.
-------------------mrpi installer log--------------------------------------------
2017-08-24 @ 15:49:09 +0200] :: [MRPI r13359] - Beginning the processing of package 'Update_rp_20131220.N_install.bin' (rp 20131220.N I) . . .
--
Running 'run.ffs' for 'rp 20131220.N I' (Update_rp_20131220.N_install.bin) @ Thu, 24 Aug 2017 15:49:10 +0200
Success!
**** **** **** ****
[2017-08-24 @ 15:49:31 +0200] :: [MRPI r13359] - Beginning the processing of package 'Update_crp_2.N_install.bin' (crp 2.N I) . . .
--
Running 'run.ffs' for 'crp 2.N I' (Update_crp_2.N_install.bin) @ Thu, 24 Aug 2017 15:49:32 +0200
Success!
**** **** **** ****
[2017-08-24 @ 15:49:40 +0200] :: [MRPI r13359] - Beginning the processing of package 'Update_downgrader_0.1.N_install.bin' (downgrader 0.1.N I) . . .
--
Running 'install.sh' for 'downgrader 0.1.N I' (Update_downgrader_0.1.N_install.bin) @ Thu, 24 Aug 2017 15:49:41 +0200
system: I downgrader:install::no official update found, nothing will happen!
system: I downgrader:install::done
Unknown HZ value! (29) Assume 100.
system: I downgrader:install::mrpi detected, rebooting ourselves...
rm: can't remove '/mnt/us/mrpackages/staging': Directory not empty
Hu oh... Got return code 1 . . .