VC runtime detection changes

src/App.js

@@ -173,6 +173,13 @@ class App extends IPCContainer {
             <MountItems remoteSupported={remoteSupported}/>
           </Box>
         ));
+      } else if(selectedVersion !== 'unavailable') {
+        mainContent.push((
+          <Box dxStyle={{padding: 'var(--default_spacing)', height: '173px'}}
+               key={'md_' + key++}>
+            <Loading/>
+          </Box>
+        ));
       }
     }
 

src/components/ReleaseVersionDisplay/ReleaseVersionDisplay.js

@@ -12,6 +12,7 @@ import {downloadItem} from '../../redux/actions/download_actions';
 
 const mapStateToProps = state => {
   return {
+    AllowMount: state.common.AllowMount,
     AppPlatform: state.common.AppPlatform,
     DismissDependencies: state.install.DismissDependencies,
     DownloadActive: state.download.DownloadActive,
@@ -35,6 +36,12 @@ const mapDispatchToProps = dispatch => {
 };
 
 export default connect(mapStateToProps, mapDispatchToProps)(props => {
+  const getSelectedVersion = () => {
+    return (props.ReleaseVersion === -1) ?
+      'unavailable' :
+      props.VersionLookup[Constants.RELEASE_TYPES[props.Release]][props.ReleaseVersion];
+  };
+
   const handleDownloadRelease = () => {
     const fileName = props.version + '.zip';
     props.downloadItem(fileName, Constants.INSTALL_TYPES.Release, props.LocationsLookup[props.version].urls);
@@ -52,7 +59,10 @@ export default connect(mapStateToProps, mapDispatchToProps)(props => {
   };
 
   const text = props.InstalledVersion + ' [' + props.AppPlatform + ']';
-  const disabled = props.DownloadActive || props.InstallActive || props.MountsBusy;
+  const disabled = props.DownloadActive ||
+    props.InstallActive ||
+    props.MountsBusy ||
+    (!props.AllowMount && (getSelectedVersion() !== 'unavailable')) ;
   const releaseExtracting = (props.InstallType === Constants.INSTALL_TYPES.Release);
 
   let optionsDisplay = [];

src/helpers.js

@@ -8,6 +8,60 @@ const spawn = require('child_process').spawn;
 const Constants = require('./constants');
 const RandomString = require('randomstring');
 
+let vcRuntimeExists;
+
+const _vcRuntimeExists = () => {
+  return new Promise((resolve, reject) => {
+    if (os.platform() !== 'win32') {
+      reject('Windows OS is not being used');
+    } else {
+      if (vcRuntimeExists) {
+        resolve(true);
+      } else {
+        const cmd = path.join(process.env.windir, 'system32', 'reg.exe');
+        const args = ["QUERY", "HKLM\\SOFTWARE\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall"];
+        _execProcessGetOutput(cmd, null, args)
+        .then(lines => {
+          const parseLine = index => {
+            if (index < lines.length) {
+              const line = lines[index];
+              if (line.startsWith('HKEY_LOCAL_MACHINE\\')) {
+                let args2 = JSON.parse(JSON.stringify(args));
+                args2[1] = 'HKLM\\' + line.substr(19);
+                args2.push('/v');
+                args2.push('DisplayName');
+                args2.push('/t');
+                args2.push('REG_SZ');
+                _execProcessGetOutput(cmd, null, args2)
+                .then(lines => {
+                  const value = lines[2].trim().substr(args2[3].length).trim().substr(6).trim();
+                  if (value.includes('Microsoft Visual C++ 2015-2019 Redistributable (x64)')) {
+                    vcRuntimeExists = true;
+                    resolve(true);
+                  } else {
+                    parseLine(++index);
+                  }
+                })
+                .catch(() => {
+                  parseLine(++index);
+                });
+              } else {
+                parseLine(++index);
+              }
+            } else {
+              resolve(false);
+            }
+          };
+          parseLine(0);
+        })
+        .catch(err => {
+          reject(err);
+        });
+      }
+    }
+  });
+};
+
 const _executeProcess = (command, working, args=[]) => {
   return new Promise((resolve, reject) => {
     let processOptions = {
@@ -542,10 +596,23 @@ module.exports.getMissingDependencies = dependencies => {
       };
 
       const Registry = require('winreg');
-      const checkRegistry = (dep, index) => {
+      const checkRegistry = (dep, index, legacyRuntimeDetection) => {
         if (index >= dep.registry.length) {
           missing.push(dep);
           resolveIfComplete();
+        } else {
+          if (!legacyRuntimeDetection && (dep.display === 'VC Runtime 2015-2019')) {
+            _vcRuntimeExists()
+              .then(exists => {
+                if (exists) {
+                  resolveIfComplete();
+                } else {
+                  checkRegistry(dep, 0, true);
+                }
+              })
+              .catch (() => {
+                checkRegistry(dep, 0, true);
+              })
           } else {
             let hive = null;
             const hiveName = dep.registry[index].split('\\')[0];
@@ -588,6 +655,7 @@ module.exports.getMissingDependencies = dependencies => {
               }
             });
           }
+        }
       };
 
       for (const dependency of dependencies) {