Added documentation for older pimcore versions

README.md

@@ -20,6 +20,13 @@ composer update elements/process-manager-bundle; bin/console process-manager:upd
 ## Release notes
 Take a look at the tags :-)
 
+## Running with Pimcore < 5.4
+With Pimcore 5.4 the location of static Pimcore files like icons has changed. In order to make this bundle work 
+with Pimcore < 5.4, please add following rewrite rule to your `.htaccess`.
+```
+    # rewrite rule for pre pimcore 5.4 core static files
+    RewriteRule ^bundles/pimcoreadmin/(.*) /pimcore/static6/$1 [PT,L]
+``` 
 ## Migration from Pimcore 4 to Pimcore 5
 
 * Create a backup of the following tables

composer.json

@@ -3,7 +3,7 @@
   "type": "pimcore-bundle",
   "description": "The Process Manager allows you to manage (define,execute...) arbitrary processes/commands in the Pimcore backend.",
   "require": {
-    "pimcore/core-version": ">=5.4.2",
+    "pimcore/core-version": ">=5.1.0 <5.4",
     "mtdowling/cron-expression": "^1.1.0"
   },
   "autoload": {