After pressing the button on Update, a window appears that all files have been changed. 

Tell me please. What is the problem?

studio/dashboard.php

Can't apply upgrade because the following files were modified: inc/classes/BxDolCronQueuePush.php, inc/classes/BxDolCronUpgradeCheck.php, inc/classes/BxDolRssFactory.php, inc/classes/BxDolProfileAnonymous.php, inc/classes/BxDolRewriteRulesQuery.php, inc/classes/BxDolRssBoonEx.php, inc/classes/BxDolCacheUtilities.php, inc/classes/BxDolGridSubscribedMe.php, inc/classes/BxDolCategory.php, inc/classes/BxDolCaptchaQuery.php, inc/classes/BxDolUploader.php, inc/classes/BxDolVoteLikesQuery.php, inc/classes/BxDolCover.php, inc/classes/BxDolAccount.php, inc/classes/BxDolCmtsReviews.php, inc/classes/BxDolCmtsReviewsQuery.php, inc/classes/BxDolBadgesQuery.php,.........................................................................get_rss_feed.php, grid.php, gzip_loader.php, image_transcoder.php, index.php, logout.php, member.php, menu.php, page.php, searchKeyword.php, searchKeywordContent.php, splash.php, storage.php, storage_uploader.php, vote.php, modules/index.php, README.md, license.txt