Although there is now a 1.06b, here's my summary of 1.05c fixes:
Add closing } to Adv. Torpedo Bomber in units\torpedo_plane.txt
Change capital to 284 in 1936\columbia.inc
Change capital to 643 in 1936\poland.inc
Join broken lines in uk.inc: Gibralter Defense Force and Singapore Defense Force
In events\increased_spheres.txt event 1504 should be USA instead of SOV. (This event is never used).
Soviet ministers in 1939 scenario are bad. (Don't know the fix for this.)
In events\increased_spheres.txt add date+offset+deathdates to USA events for South America.
In 1936\italy.inc remove the partial 'airunit':
airunit = {
location = 906
id = { type = 14000 id = 185 }
name = "8a Divisione Caccia 'Astore'"
##########################################
In db\tech\armor_tech.txt add 11407 (Armored Spearhead Doctrine) to prereqs for IMT80. (Or remove it from other IMTs as was done in 1.06.)
In db\events\usa.txt event 3705: remove random trigger, add 'exists = DEN' trigger, change offset to '1'
Reverse sign of 'ground_def_eff' modifications in tech files to workaround bug; variable affects ENEMY instead of friendly troops.
Only with picture packs:
In db\events\finland.txt event 3200 action_a change minister id 29099 to 29104 and 29100 to 29105 (both Carl G. Mannerheim).
With November 4 picture pack:
In db\leaders\usa.csv Lee;60223;USA;2;253 should be Lee;60223;USA;2;257