I am trying to install Forge 1.16.5 - 36.1.0, however the installation menu won't even appear when I open the downloaded .jar file.

Console Log: (Mac)

JVM info: Oracle Corporation - 1.8.0_281 - 25.281-b09
java.net.preferIPv4Stack=true
Found java version 1.8.0_281
Exception in thread "main" 
java.lang.ExceptionInInitializerError
    at javax.crypto.Cipher.getInstance(Cipher.java:518)
    at sun.security.ssl.JsseJce.getCipher(JsseJce.java:189)
    at sun.security.ssl.SSLCipher.isTransformationAvailable(SSLCipher.java:483)
    at sun.security.ssl.SSLCipher.<init>(SSLCipher.java:472)
    at sun.security.ssl.SSLCipher.<clinit>(SSLCipher.java:81)
    at sun.security.ssl.CipherSuite.<clinit>(CipherSuite.java:67)
    at sun.security.ssl.SSLContextImpl.getApplicableSupportedCipherSuites(SSLContextImpl.java:345)
    at sun.security.ssl.SSLContextImpl.access$100(SSLContextImpl.java:46)
    at sun.security.ssl.SSLContextImpl$AbstractTLSContext.<clinit>(SSLContextImpl.java:577)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at java.security.Provider$Service.getImplClass(Provider.java:1728)
    at java.security.Provider$Service.newInstance(Provider.java:1686)
    at sun.security.jca.GetInstance.getInstance(GetInstance.java:236)
    at sun.security.jca.GetInstance.getInstance(GetInstance.java:164)
    at javax.net.ssl.SSLContext.getInstance(SSLContext.java:156)
    at javax.net.ssl.SSLContext.getDefault(SSLContext.java:96)
    at javax.net.ssl.SSLSocketFactory.getDefault(SSLSocketFactory.java:122)
    at javax.net.ssl.HttpsURLConnection.getDefaultSSLSocketFactory(HttpsURLConnection.java:332)
    at javax.net.ssl.HttpsURLConnection.<init>(HttpsURLConnection.java:289)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.<init>(HttpsURLConnectionImpl.java:99)
    at sun.net.www.protocol.https.Handler.openConnection(Handler.java:62)
    at sun.net.www.protocol.https.Handler.openConnection(Handler.java:57)
    at java.net.URL.openConnection(URL.java:1001)
    at net.minecraftforge.installer.DownloadUtils.getConnection(DownloadUtils.java:197)
    at net.minecraftforge.installer.DownloadUtils.downloadMirrors(DownloadUtils.java:253)
    at net.minecraftforge.installer.json.Install.getMirror(Install.java:116)
    at net.minecraftforge.installer.InstallerPanel.updateFilePath(InstallerPanel.java:370)
    at net.minecraftforge.installer.InstallerPanel.<init>(InstallerPanel.java:351)
    at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:169)
    at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:143)
Caused by: java.lang.SecurityException: Can not initialize cryptographic mechanism
    at javax.crypto.JceSecurity.<clinit>(JceSecurity.java:93)
    ... 31 more
Caused by: java.lang.SecurityException: The jurisdiction policy files are not signed by the expected signer! (Policy files are specific per major JDK release.Ensure the correct version is installed.)
    at javax.crypto.JarVerifier.verifyPolicySigned(JarVerifier.java:336)
    at javax.crypto.JceSecurity.loadPolicies(JceSecurity.java:378)
    at javax.crypto.JceSecurity.setupJurisdictionPolicies(JceSecurity.java:323)
    at javax.crypto.JceSecurity.access$000(JceSecurity.java:50)
    at javax.crypto.JceSecurity$1.run(JceSecurity.java:85)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.crypto.JceSecurity.<clinit>(JceSecurity.java:82)
    ... 31 more
 

Thanks

Uninstalled Java and reinstalled, and that fixed it. Thank you