[MCL-13585] 1.15.json does not exist

I was using the 1.6.91 jar launcher through Twitch and I had played just a couple weeks ago, but yesterday when I launched it, it was getting stuck on loading versions, so I downloaded the 1.6.93 launcher today after looking on here and replaced the old one, and now it loads versions but when I hit play it crashes and in the launcher log it reads:

[22:12:13 INFO]: Looking for orphaned versions to clean up...[22:12:13 FATAL]: Fatal error launching game. Report this to http://bugs.mojang.com please!java.io.FileNotFoundException: File '/Users/jacobleitza/Twitch/Minecraft/Install/assets/indexes/1.15.json' does not exist at org.apache.commons.io.FileUtils.openInputStream(FileUtils.java:299) ~[launcher.jar:1.6.93] at org.apache.commons.io.FileUtils.readFileToString(FileUtils.java:1711) ~[launcher.jar:1.6.93] at net.minecraft.launcher.Launcher.cleanupOrphanedAssets(Launcher.java:298) ~[launcher.jar:1.6.93] at net.minecraft.launcher.Launcher.performCleanups(Launcher.java:540) ~[launcher.jar:1.6.93] at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:209) ~[launcher.jar:1.6.93] at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:186) [launcher.jar:1.6.93] at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:122) [launcher.jar:1.6.93] at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:1.6.93] at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:1.6.93] at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?] at java.base/java.lang.Thread.run(Thread.java:835) [?:?][22:12:15 ERROR]: Game ended with bad state (exit code 1)[22:12:15 INFO]: Ignoring visibility rule and showing launcher due to a game crash[22:12:15 INFO]: Deleting /Users/jacobleitza/Twitch/Minecraft/Install/versions/forge-31.1.30/forge-31.1.30-natives-6446516431538

I'm really not any good with code and I didn't see any other issue on here that was similar so I'd much appreciate some help. Thanks in advance!