windows setup: allow installation on older Windows version

The REST API CLI will not be installed on version < 10

Fixes #205

windows-installer/sftpgo.iss

@@ -33,7 +33,7 @@ WizardStyle=modern
 ArchitecturesInstallIn64BitMode=x64
 PrivilegesRequired=admin
 ArchitecturesAllowed=x64
-MinVersion=10
+MinVersion=6.1
 VersionInfoVersion={#MyVersionInfo}
 
 [Languages]
@@ -44,7 +44,7 @@ Source: "{#MyAppDir}\sftpgo.exe"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#MyAppDir}\sftpgo.db"; DestDir: "{commonappdata}\{#MyAppName}"; Flags: onlyifdoesntexist uninsneveruninstall
 Source: "{#MyAppDir}\LICENSE.txt"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#MyAppDir}\sftpgo.json"; DestDir: "{commonappdata}\{#MyAppName}"; Flags: onlyifdoesntexist uninsneveruninstall
-Source: "{#MyAppDir}\sftpgo_api_cli.exe"; DestDir: "{app}\examples\rest-api-cli"; Flags: ignoreversion
+Source: "{#MyAppDir}\sftpgo_api_cli.exe"; DestDir: "{app}\examples\rest-api-cli"; Flags: ignoreversion; MinVersion: 10
 Source: "{#MyAppDir}\templates\*"; DestDir: "{commonappdata}\{#MyAppName}\templates"; Flags: ignoreversion recursesubdirs createallsubdirs
 Source: "{#MyAppDir}\static\*"; DestDir: "{commonappdata}\{#MyAppName}\static"; Flags: ignoreversion recursesubdirs createallsubdirs
 
@@ -56,7 +56,7 @@ Name: "{commonappdata}\{#MyAppName}\credentials"; Permissions: everyone-full
 [Icons]
 Name: "{group}\Web Admin"; Filename: "http://127.0.0.1:8080/web";
 Name: "{group}\Service Control";  WorkingDir: "{app}"; Filename: "powershell.exe"; Parameters: "-Command ""Start-Process cmd \""/k cd {app} & {#MyAppExeName} service --help\"" -Verb RunAs"; Comment: "Manage SFTPGo Service"
-Name: "{group}\REST API CLI";  WorkingDir: "{app}\examples\rest-api-cli"; Filename: "{cmd}"; Parameters: "/k sftpgo_api_cli.exe --help"; Comment: "Manage users, folders and connections"
+Name: "{group}\REST API CLI";  WorkingDir: "{app}\examples\rest-api-cli"; Filename: "{cmd}"; Parameters: "/k sftpgo_api_cli.exe --help"; Comment: "Manage users, folders and connections"; MinVersion: 10
 Name: "{group}\Documentation"; Filename: "{#DocURL}";
 Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"