Ahoy and welcome!
Yeah, as it stands right now, if your connection is dodgy, SH5 is going to be problematic because of the DRM.
SH3 is probably your best bet if you want something similar to SH5 in that you would still be simming in a WWII era German u-boat. Given all the mods and supermods available, it's pretty much a no-brainer and highly recommended. Also can be had at a bargain price these days, fully patched and with no DRM if you're buying a new copy.
SH4 is a sim for WWII era US subs in the Pacific theater, but there is an add-on pack that lets you play in a German u-boat. There are also mods available for it. I haven't played it (yet) so don't know as much about it but as Jimbuna said, you'll find lots of info in the forums dedicated to each game and its mods.
Happy hunting!
|