I can not install or update to version 1.0.5

I can not install or update to version 1.0.5

I get this error on a fresh install:

Till?gget kunde inte aktiveras eftersom det orsakade ett allvarligt fel.

Warning: require(E:\wamp64\www\company\wp-content\plugins\qbank-dam-connector\vendor\composer/../symfony/polyfill-mbstring/bootstrap.php): failed to open stream: No such file or directory in E:\wamp64\www\company\wp-content\plugins\qbank-dam-connector\vendor\composer\autoload_real.php on line 66

Fatal error: require(): Failed opening required ‘E:\wamp64\www\company\wp-content\plugins\qbank-dam-connector\vendor\composer/../symfony/polyfill-mbstring/bootstrap.php’ (include_path=’.;C:\php\pear’) in E:\wamp64\www\company\wp-content\plugins\qbank-dam-connector\vendor\composer\autoload_real.php on line 66