windows: Support alt install paths, fit and finish (#6967)

* windows: Support alt install paths

Advanced users are leveraging innosetup's /DIR switch to target
an alternate location, but we get confused by things not existing in the LocalAppData dir.
This also hardens the server path lookup code for a future attempt to unify with a ./bin prefix

* Fit and finish improvements for windows app

Document alternate install location instructions for binaries and model.
Pop up progress UI for upgrades (automatic, with cancel button).
Expose non-default port in menu to disambiguate mutiple instances.
Set minimum Windows version to 10 22H2

docs/windows.md

@@ -25,6 +25,32 @@ Logs will often be helpful in diagnosing the problem (see
 
 Ollama uses unicode characters for progress indication, which may render as unknown squares in some older terminal fonts in Windows 10. If you see this, try changing your terminal font settings.
 
+## Filesystem Requirements
+
+The Ollama install does not require Administrator, and installs in your home directory by default.  You'll need at least 4GB of space for the binary install.  Once you've installed Ollama, you'll need additional space for storing the Large Language models, which can be tens to hundreds of GB in size.  If your home directory doesn't have enough space, you can change where the binaries are installed, and where the models are stored.
+
+### Changing Install Location
+
+To install the Ollama application in a location different than your home directory, start the installer with the following flag
+
+```powershell
+OllamaSetup.exe /DIR="d:\some\location"
+```
+
+### Changing Model Location
+
+To change where Ollama stores the downloaded models instead of using your home directory, set the environment variable `OLLAMA_MODELS` in your user account.
+
+1. Start the Settings (Windows 11) or Control Panel (Windows 10) application and search for _environment variables_.
+
+2. Click on _Edit environment variables for your account_.
+
+3. Edit or create a new variable for your user account for `OLLAMA_MODELS` where you want the models stored
+
+4. Click OK/Apply to save.
+
+If Ollama is already running, Quit the tray application and relaunch it from the Start menu, or a new terminal started after you saved the environment variables.
+
 ## API Access
 
 Here's a quick example showing API access from `powershell`
@@ -52,6 +78,10 @@ the explorer window by hitting `<cmd>+R` and type in:
 
 The Ollama Windows installer registers an Uninstaller application.  Under `Add or remove programs` in Windows Settings, you can uninstall Ollama.
 
+> [!NOTE]
+> If you have [changed the OLLAMA_MODELS location](#changing-model-location), the installer will not remove your downloaded models
+
+
 ## Standalone CLI
 
 The easiest way to install Ollama on Windows is to use the `OllamaSetup.exe`