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Get HBO GO EU apk for
Fire Os 5 : hbogo_5.9.0-161_minAPI22-ftvgen2.apk http://s000.tinyupload.com/index.php?file_id=90956637726491859654
Fire OS 6+: hbogo_5.11.6-210_minAPI23-ftv4k.apk  http://s000.tinyupload.com/index.php?file_id=84070932222269429579

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HOWTO fix crash for Fire OS:

hbo go eu 5.11.6 - fire tv 4k (Fire Os 6+)
get the original apk: https://www.apkmirror.com/apk/hbo-holding-zrt/hbo-go-europe-android-tv/hbo-go-europe-android-tv-5-11-6-release/hbo-go-europe-android-tv-5-11-6-android-apk-download/
Save as hbogo_5.11.6-210_minAPI23.apk

Manual for patching (apktool_2.4.1):
https://yasoob.me/posts/reverse-engineering-android-apps-apktool/

unpack:
apktool d hbogo_5.11.6-210_minAPI23.apk

Disable Recommendation upadate that is not exists any more on Fire OS. Comment out one line:
hbogo_5.11.6-210_minAPI23/assets/www/scripts/application.json

ListView.prototype.updateOSFeeds = function() {
      var groupData, ref;
      groupData = this.model.get('groups').models;
      if (Config.platform === "tizen") {
        return SamsungAcceleratorManager.updateEdenFeed(groupData);
      } else if ((ref = Config.platform) === "androidtv") {
==>>        //return AndroidRecommendManager.updateRecommendFeed(groupData);
      }
    };


repack:
apktool b hbogo_5.11.6-210_minAPI23
cd hbogo_5.11.6-210_minAPI23/dist
jarsigner -verbose -sigalg MD5withRSA -digestalg SHA1 -keystore ~/.android/debug.keystore -storepass android hbogo_5.11.6-210_minAPI23.apk androiddebugkey
zipalign  -v 4 hbogo_5.11.6-210_minAPI23.apk  hbogo.5.11.6-210_minAPI23-ftv4k.apk

Remove old app from the device before installing this one.
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For Fire tv stick gen2 (Fire Os 5) you need old version
https://www.apkmirror.com/apk/hbo-holding-zrt/hbo-go-europe-android-tv/hbo-go-android-tv-android-tv-2-5-9-0-release/hbo-go-android-tv-5-9-0-android-apk-download/

Do the same for recommendation.
Also change minSdkVersion to 22 in apktool.yml