1. Install folder is generally good, so long as you are not in the root of a drive, and NOT in a Program Files folder, or any other "protected" Windows folders. When installing to H:, I would change the path in the installation to read "H:\Games \SH4" and let it rip there.
2. Using
Post 216 in "Silent Hunter 4 & Windows 10" should work fine, since Win10 and 11 are basically the same in this regard. However, you will have to experiment with those settings. You most likely will need to use "Compatibility mode" for Win7 or earlier, but NOT Win98 or earlier, of course... You will most likely need to click "Disable fullscreen optimizations". You shouldn't need "Run this program as administrator", but it almost sounds like you are not using an Administrator type User Account?? That Compatibility page causes the most trouble anymore for the Silent Hunter games, since Windows wants to "help" you so much...
3. The key code is not really an online thing at all. So long as you have entered it in a fresh install on your hard drive, you should be good to go. The game definitely wants to run in an unrestricted Administrators-type account, though some folks do not have issues with that, if they use "Administrator" on the SH4 Properties page.
4. Good choice. It will not alleviate the problem. Get the base game running first. Then do the U-Boat Missions Add-On, then delete the Save folder (C:\Users \UserName \Documents \SH4) before running the game again.
5. Registration at Ubi with the disk version is no longer supported. Their download version does it fine, but since you probably registered years ago with it, no need to do it again. Tell the dialog "Never"...
6. You ~should~ be able to use the DVD version. One thing you could try if all else fails, is to re-do the install, but by right-clicking on the installer, and choosing "Run as administrator" on that... I cannot remember the name of the file on the disk at this time...
Good luck!
