Coming from the latest Gallery release I tried to update to the newest candidate, as I'm working on Teensy.
VS2019, arduino 1.8.9.
I get a prompt stating the the package did not load correctly, and directs me to a AtivityLog.XML file, which states that it can't file the package's dll file.
Here's the relevant segment:
<entry>
<record>753</record>
<time>2019/06/30 07:00:22.865</time>
<type>Information</type>
<source>VisualStudio</source>
<description>Begin package load [Visual_Micro_StudioPackage]</description>
<guid>{C2B94433-1774-4242-8062-987A4484F1ED}</guid>
</entry>
<entry>
<record>754</record>
<time>2019/06/30 07:00:22.866</time>
<type>Error</type>
<source>VisualStudio</source>
<description>CreateInstance failed for package [Visual_Micro_StudioPackage]Source: 'mscorlib' Description: Could not load file or assembly 'file:///c:\program files (x86)\microsoft visual tudio.dll' or one of its dependencies. The system cannot find the file specified.
System.IO.FileNotFoundException: Could not load file or assembly 'file:///c:\program files (x86)\microsoft visual tudio.dll' or one of its dependencies. The system cannot find the file specified.
File name: 'file:///c:\program files (x86)\microsoft visual tudio.dll'
 at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
 at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
 at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
 at System.Reflection.RuntimeAssembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, Boolean suppressSecurityChecks, StackCrawlMark& stackMark)
 at System.Reflection.Assembly.LoadFrom(String assemblyFile, Evidence securityEvidence)
 at System.Activator.CreateInstanceFromInternal(String assemblyFile, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo)
 at System.AppDomain.CreateInstanceFrom(String assemblyFile, String typeName)

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].
</description>
<guid>{C2B94433-1774-4242-8062-987A4484F1ED}</guid>
<hr>80004005 - E_FAIL</hr>
<errorinfo></errorinfo>
</entry>
</activity>
Uninstalling the package, and returning to any build before 1906_26_0 (including) fixes the issue.
Is the build not stable yet, or did I miss something?
Thanks in advance.
EDIT: to clarify, all builds from 1906.26.4 onward cause the same issue.